Calculate the pH at the equivalence point for the following titration: 0.25 M HCOOH versus 0.25 M NaOH.
The pH at the equivalence point for the titration of 0.25 M HCOOH versus 0.25 M NaOH is 8.5.
Let's consider the following neutralization reaction.
HCOOH + NaOH ⇒ HCOONa + H₂O
At the equivalence point, 0.25 M HCOOH completely reacted with 0.25 M NaOH to form 0.25 M HCOONa.
HCOONa undergoes hydrolysis. The net ionic equation is:
HCOO⁻(aq) + H₂O(l) ⇄ HCOOH(aq) + OH⁻(aq)
Given the concentration of HCOO⁻ is 0.25 M (Cb) and the basic dissociation constant of HCOO⁻ is 4.8 × 10⁻¹¹ (Kb), we can calculate the concentration of OH⁻ using the following expression.
[tex][OH^{-} ] = \sqrt{Kb \times Cb } = \sqrt{(4.8 \times 10^{-11} ) \times 0.25 } = 3.5 \times 10^{-6} M[/tex]
The pOH of the solution is:
[tex]pOH = -log [OH^{-} ] = -log (3.5 \times 10^{-6} ) = 5.5[/tex]
The pH of the solution is:
[tex]pH = 14 -pOH = 14 -5.5 = 8.5[/tex]
The pH at the equivalence point for the titration of 0.25 M HCOOH versus 0.25 M NaOH is 8.5.
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How are metals, metalloids, nonmetals grouped
no I will not please put you because that's the god of the Bible
Metals are good conductors of heat and electricity, and are malleable (they can be hammered into sheets) and ductile (they can be drawn into wire).
Nonmetals are (usually) poor conductors of heat and electricity, and are not malleable or ductile; many of the elemental nonmetals are gases at room temperature, while others are liquids and others are solids.
The metalloids are intermediate in their properties. In their physical properties, they are more like the nonmetals, but under certain circumstances, several of them can be made to conduct electricity.
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Identify the movements of the glenohumeral joint that occur with contraction of the infraspinatus and teres minor.
Answer: adduction of the arm
lateral rotation of the arm
Explanation:
How many atoms are in mercury phosphate
Answer:
There are 95 atoms in mercury phosphate
Explanation:
You just add the atomic number for both elements
The
is the wind system responsible for the movement of weather from west to east across most of the continental United States
A
polar easterlies
B
prevailing westerlies
C
trade winds
Answer:
Westerlies are prevailing winds that blow from the west at midlatitudes. They are fed by polar easterlies and winds from the high-pressure horse latitudes, which sandwich them on either side.Nov 15, C answer
Which statement about petroleum fractions is correct?
A. All petroleum fractions are used as fuels.
B. Gas oil is used to make bottled gas for heating.
C. Hydrocarbons in diesel have higher boiling points than hydrocarbons in
gasoline.
D. Molecules in kerosene are larger than molecules in fuel oil.
Answer: It is either C. or D.
Explanation: I did some reading about it and it talks about fuel but I know that it didn’t say all of them are used as fuels. maybe I’m wrong
Petroleum is composed of hydrocarbons of various chain length. Different products can be extracted from petroleum but all products cannot be used as fuel.
Hydrocarbons in diesel have higher boiling point than that of gasoline.
What is petroleum?Petroleum is a naturally occurring crude liquid mixture of hydrocarbons. Petroleum can be fractionated to different components such as gasoline, kerosene, diesel etc.
Each fraction vary in the number of carbons and hydrogens in it or called the difference in chain length. Kerosene contains 8-16 carbons where as gasoline and diesel have more carbons.
Not all products of petroleum fractionation can be used as fuel. Some of them with effective quality is taken as fuels.
The boiling point of hydrocarbons in diesel is greater (about 130-380 degree Celsius) than the hydrocarbons in gasoline which is having boiling point in he range 30-225 degree Celsius.
Therefore, the statement C is correct.
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A 1.8 mole sample of a compound weighs 195 g and is found to be 11.18% H and 88.82% C. What is the molecular formula for the compound?
Answer:
C8H12
Explanation:
First find the molar mass
195/1.8 × 1 = 108.3 gmol-1
Then the molecular formula
Mass of C in 1 mole of compound = 88.82×108.3/100
= 96.2 g
Mass of H in 1 mol of.the compound = 108.3×11.18/100 = 12.11 g
Divide the mass by their molar masses to get no. of moles in 108.3 g of compound or 1 mole of compound
Moles of C in one Mole of compound = 96.2g/12 gmol-1 = 8 mol
Moles of H in 1 mole of compound = 12.11g/1 gmol-1 =12 mol
Since we need the molecular formula it's C8H12
Which two metals shown won't make a solid when combined with anything? 2.2.2
Answer:
aluminum Zicam iron
Explanation:
Which metals dont react with anything?
Metals like aluminium, iron and zinc do not react either with cold or hot water. But they react with steam to form the metal oxide and
Will give Brainliest
Use the image to answer the question.
An illustration shows the process that takes place in a cold pack. The warm cold pack has ammonium nitrate on one side and water on the other. The water is kept separate in a thin plastic bag. The pack is squeezed and the inner bag bursts. The mixture cools as ammonium nitrate dissolves.
Which kind of reaction is shown in this image?
(1 point)
It is an endothermic reaction because the system takes energy from the surroundings.
It is an exothermic reaction because the surroundings take energy from the system.
It is an endothermic reaction because the surroundings take energy from the system.
It is an exothermic reaction because the system takes energy from the surroundings.
Answer:
it is an endothermic reaction because the system takes energy from the surrounding.
Answer:
It is an endothermic reaction because the system takes energy from the surroundings.
Explanation:
I did the test.
how much heat will we use when 30 grams of ice turns into water at 30 degrees Celsius?
Answer:
more heat
Explanation:
more heat bro , more heat
Explanation:
The answer is given in the question
When 0.717 g of sodium metal is added to an excess of hydrochloric acid, 7450 J of heat are produced. What is the enthalpy of the reaction as written?
2Na(s)+2HCl(aq)⟶2NaCl(aq)+H2(g)
Answer:
The enthalpy change of the reaction is 4.78 × 10⁴ J.
Explanation:
We are given that 0.717 g of sodium metal reacts with hydrochloric acid to produce 7450 J of heat.
Converting grams of sodium to moles:
[tex]\displaystyle 0.717 \text{ g Na} \cdot \frac{1 \text{ mol Na}}{22.99 \text{ g Na}} = 0.0312 \text{ mol Na}[/tex]
And dividing the amount of heat produced by the moles of sodium reacted yields:
[tex]\displaystyle \Delta H = \frac{7450 \text{ J}}{0.312 \text{ mol Na}} = 2.39 \times 10^4 \text{ J/mol Na}[/tex]
Because the given reaction has two moles of sodium metal, we can multiply the above value by two to acquire the enthalpy change of the given reaction:
[tex]\displaystyle \Delta H = 2\text{ mol Na}\left(2.39 \times 10^4 \text{ J/mol Na}}\right) = 4.78 \times 10^4 \text{ J}[/tex]
In conclusion, the enthalpy change of the reaction is 4.78 × 10⁴ J.
How many moles of lithium hydroxide would be required to produce 38.5 g of Li₂CO₃ in the following chemical reaction?
2 LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
Numer of moles of Li₂CO₃:
[tex]\longrightarrow\: n_{(Li_2 CO_3)} = \dfrac{38.5}{(6 \times 2) + 12 + (16 \times 3)}[/tex]
[tex]\longrightarrow\: n_{(Li_2 CO_3)} = \dfrac{38.5}{12+ 12 +48}[/tex]
[tex]\longrightarrow\: n_{(Li_2 CO_3)} = \dfrac{38.5}{72}[/tex]
[tex]\longrightarrow\: n_{(Li_2 CO_3)} = 0.53473 \: mol[/tex]
Chemical Reaction:
2 LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
1 mole of Li₂CO₃ is formed from 2 moles of LiOH.Therefore, applying unitary method:
0.53473 mole of Li₂CO₃ is formed from 2 × 0.53473 = 1.06946 moles of LiOH.No. of moles of lithium hydroxide would be required to produce 38.5 g of Li₂CO₃ in the following chemical reaction are 1.03.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
Given,
2LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
2 moles of LiOH are required to produce 73.8g Li₂CO₃
0.027 moles of LiOH are required to produce 1g Li₂CO₃
1.03 moles of LiOH are required to produce 38.5 Li₂CO₃
Therefore, No. of moles of lithium hydroxide would be required to produce 38.5 g of Li₂CO₃ in the following chemical reaction are 1.03.
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How many aluminum ions are present in 65.5 mL of 0.210 M All3solution?
Answer:
Aluminium ions present's in 65.5mL of 0.210
M All 3solution is Given below-:
Answer and Explanation: 1
The first step is to determine the moles of aluminum ions. This utilizes the volume, molar concentration, and subscripts from the chemical formula of aluminum (III) fluoride as shown.
65.5 mL×1 L1000 mL×0.210 mol AlF31 L×1 mol Al3+1 mol AlF3=0.013755 mol Al3+65.5 mL×1 L1000 mL×0.210 mol AlF31 L×1 mol Al3+1 mol AlF3=0.013755 mol Al3+
To calculate for the number of aluminum ions, we use Avogadro's number as shown.
0.013755 mol Al3+×6.022×1023 ions1 mol Al3+=8.28×1021 ions Al3+.
Itz the ans. of collage ok man.
Answer:
m0.013755
m
o
l
A
l
3
+
×
6.022
×
10
23
i
o
n
s
1
m
o
l
A
l
3
+
=
8.28
×
10
21
i
o
n
s
A
l
3
+
L
×
1
L
1000
m
L
×
0.210
m
o
l
A
l
F
3
1
L
×
1
m
o
l
A
l
3
+
1
Explanation:
The first step is to determine the moles of aluminum ions. This utilizes the volume, molar concentration, and subscripts from the chemical formula of aluminum (III) fluoride as shown.
65.5. To calculate for the number of aluminum ions, we use Avogadro's number as shown.
Which of these is the condensed structural formula for an alkane with four carbon
atoms?
O CH3CH2CH2CH3
H
HLH
1C
H
C2
LH
I
C
HTH Н
H
0-I
I
क
H
OCH3CHCHCH3
OC-C-C-C
Answer:
First option
Explanation:
The option that says CH3CH2CH2CH3 is the correct option (I hope that I am right because the order of the answers is not very clear :/)
name 2 elements that are liquid at room temperature and describe their colour
Answer:
Bromine
Mercury
Bromine (symbol Br and atomic number 35) is a reddish-brown liquid, with a melting point of 265.9 K. Mercury (symbol Hg and atomic number 80) is a toxic shiny silvery metal, with a melting point of 234.32 K.
WILL MARK BRAINLIEST IF YOU ANSWER EVERY QUESTION!!!!
Answer:
The answer for number one is .A
The answer for number two is heat rises
Explanation:
If an HPLC procedure is running at a pressure of 5.48×10^8 Pa what is it’s running pressure in torr
How many molecules are present in 4.61x10-2 mol of O2
Answer:
6.02 × 1023
The molar mass from the periodic table is 32.00 g O2 = 1 mol O2, and by definition, 1 mol O2 = 6.02 × 1023 molecules O2.
Calculate the mass of 5.3 moles of chloric acid (HClO3). Explain the process or show your work by including all values used to determine the answer.
Answer:
447.64 grams
Explanation:
To find the mass when given moles, it is a pretty simple process.
I start by finding the molar mass of chloric acid, which comes out to 84.46 grams/mol. To find the MM (molar mass), you just take the mass of each element in the molecule from the periodic table and add them all together.
After this, you set up the equation by taking the moles given and multiplying it by the molar mass. This gives you the new value in grams (since we cancelled out the moles). I have attached my work below.
I hope this helps! :^)
The mass of 5.3 moles chloric acid has been 447.85 g.
The mass of 1 mole of a compound has been equivalent to the molar mass of the compound. The molar mass of a compound has been the sum of the constituent atoms in a formula unit.
The molar mass (mwt) of chloric acid has been given as:
[tex]mwt=m_H\;+\;m_C_l\;+\;(m_O\;\times\;3)[/tex]
By substituting the values for the mass of constituent atoms, the molar mass has been given as:
[tex]mwt=1\;+\;35.5\;+\;16\;\times\;3\\mwt=36.5\;+\;48\\mwt=84.5[/tex]
The molar mass of chloric acid has been 84.5 g/mol.
The mass of 1 mole of chloric acid has been 84.5 g/mol. The mass of 5.3 moles chloric acid has been:
[tex]\rm 1\;mol=84.5\;g\\5.3\;mol=5.3\;\times\;84.5\;g\\5.3\;mol=447.85\;g[/tex]
The mass of 5.3 moles chloric acid has been 447.85 g.
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An atom has the following electron configuration.
1s22s22p63s23p64s2
How many valence electrons does this atom have?
Answer:
2
Explanation:
4s2 has 2 valence electrons
Valence shell is the shell which is the outermost shell, that is filled in the last, before valence shell is penultimate shell. Therefore 2 valence electron are there in the valence shell.
What is element?Element generally consist of atoms or we can say atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
From our question the electronic configuration of element is given as
1s²2s²2p⁶3s²3p⁶4s²
Valence electron is the one which is present in the outermost shell or orbit. So, form above electronic configuration we can say that 4 is the outermost shell and in this shell 2 electron is present. Therefore 2 electron are there in the valence shell as valence electron.
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Bio fuel is a mixture of petrol and 20%——————
Answer:
methane and petrol okkkkkkkkkkkkkkkkkkk
People use solution of Na3PO4 to clean walls before putting up wall paper. If the entration is 1.7% (m/v). What mass of Na3PO4 is needed to make 2L of solution?
Answer:
34 grams
Explanation:
Assuming m/v means mass of solute / volume of solvent, then set up the equation:
1.7/100=m/2000, by cross multiplication, m=34 grams
What is the limiting reactant from this equation
Answer:
A Option is the correct answer.
Explanation:
Calculate the pH when the following quantities of 0.100 M NaOH solution have been added to 50.0 mL of 0.100 M HCl solution
Answer:
see explanation
Explanation:
Given 0.100M NaOH + 50ml 0.100M HCl
If 50ml of 0.100M NaOH is added to 50ml 0.100M HCl => pH = 7
if less than 50ml of 0.100M NaOH => pH < 7
if more than 50ml of 0.100M NaOH => pH > 7.
Example:
50ml(0.100M NaOH) + 50ml(0.100MHCl) =>
0.500mole NaCl + 0.500mole H₂O
In this mix, both NaOH and HCl are converted to NaCl and H₂O and NaOH or HCl are no longer present giving a neutral solution. Since neither Na⁺ nor Cl⁻ undergo hydrolysis, the pH is dependent upon H₂O ⇄ H⁺ + OH⁻ and [H⁺] = [OH⁻] = 10⁻⁷M => pH = -log[H⁺] = -log(10⁻⁷) = -(-7) = 7
If less than 50ml of 0.100M NaOH is added, the mix will have an excess of HCl and the pH will be acidic; i.e., less than 7.
If more than 50ml of 0.100M NaOH is added, the mix will have an excess of NaOH and the pH will be alkaline (basic); i.e., greater than 7.
explain why water wasn't used in crackers?
How many grams of oxygen will react with 2.0 grams of iron II sulfide?
Answer:
How many grams Iron(II) Sulfide in 1 mol? The answer is 87.91. We assume you are converting between grams Iron(II) Sulfide and mole. You can view more details on each measurement unit: molecular weight of Iron(II) Sulfide or mol The molecular formula for Iron(II) Sulfide is FeS. The SI base unit for amount of substance is the mole.
Explanation:
the role of haemoglobin in the transport of oxygen and carbon dioxide
Hemoglobin with bound carbon dioxide and hydrogen ions is carried in the blood back to the lungs, where it releases the hydrogen ions and carbon dioxide and rebinds oxygen. Thus, hemoglobin helps to transport hydrogen ions and carbon dioxide in addition to transporting oxygen.
HELP
How can you tell if mass is being conserved
10. Based on their valence electrons, how many
atoms of chlorine are expected to bond
with each of the following elements?
a. carbon
b. nitrogen
c. aluminum
d. sulfur
will share 2 elctrons with 2 Cl to form
S in column 16 WILL SHARE 2 ELECTRONS WITH 2 /Cl to form
SCl2
,
Answer:
a. carbon CCl4
b. nitrogen NCl3
c. aluminum AlCl3
d. sulfur SCl2
Explanation:
10. Based on their valence electrons, how many
atoms of chlorine are expected to bond
with each of the following elements?
a. carbon CCl4
b. nitrogen NCl3
c. aluminum AlCl3
d. sulfur SCl2
Cl is in Periodic Table column 17, so it has 7 valence and needs 1 more to have an electronic structure like its nearest noble gas, Ar.
It then has an oxidation state 0f -1.
Carbon in column has +/-4 charge, so 4 Cl will bond with 1 C to make
covalent CCl4
Nitrogen in column 15 is -3. It will share 3 electrons with 3 Cl to form
covalent NCl3
Al in column 13 give away 3 electrons to 3 Cl to form
ionic AlCl3
S in column 16 will share 2 electrons with 2 Cl and frorm
SCl2
identify each of the following changes of states as melting ,freezing,sublimation or deposition
a: ice sculpture start breaking down as temperature rise above 0 degree
Answer:
Melting
Explanation:
Ice begins to melt at 0 degrees celsius
Melting is from solid to liquid
Freezing is from liquid to solid
Sublimation is from solid to gas
Deposition is from gas to solid