Chemistry & Chemical Reactivity
9th Edition
ISBN: 9781133949640
Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher: Cengage Learning
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Chapter 20, Problem 42IL
Interpretation Introduction
Interpretation: The percentage of
Concept introduction:
Concentration of a solution can be expressed in molarity.
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(a)
A student carries out a titration to find the concentration of some sulfuric acid.
The student finds that 25.00 cm of 0.0880 mol dm aqueous sodium
hydroxide, NaOH, is neutralised by 17.60 cm of dilute sulfuric acid,
H2SO4.
-3
H2SO4(aq) + 2NaOH(aq) → Na2SO,(aq) + 2H2O(1)
(i)
Calculate the amount, in moles, of NaOH used.
answer =
mol
(ii)
Determine the amount, in moles, of H2SO4 used.
answer
mol
(ii) Calculate the concentration, in mol dm3, of the sulfuric acid.
answer =
mol dm3
(b) After carrying out the titration in (a), the student left the resulting solution to
crystallise. White crystals were formed, with a formula of Na2SO4•x H2O
and a molar mass of 322.1 g mol.
What term is given to the x H2O' part of the formula?
Using the molar mass of the crystals, calculate the value of x.
answer =
To measure the amount of calcium carbonate (CaCO3) in a seashell, an analytical chemist crushes a 4.30 g sample of the shell to a fine powder and titrates it
to the endpoint with 233. mL of 0.2700M hydrogen chloride (HCI) solution.
The balanced chemical equation for the reaction is:
2HCl(aq) + CO3(aq) → H₂CO3(aq) + 2Cl(aq)
19 0
What kind of reaction is this?
O precipitation
O acid-base
redox
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If you said this was a precipitation reaction, enter the chemical formula of the
precipitate.
0
Ar
If you said this was an acid-base reaction, enter the chemical formula of the
reactant that is acting as the base.
If you said this was a redox reaction, enter the chemical symbol of the element
that is oxidized.
Calculate the mass percent of CaCO3 in the sample. Be sure your answer has 3
significant digits.
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0
0%
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To measure the amount of calcium carbonate (CaCO3) in a seashell, an analytical chemist crushes a 4.20 g
sample of the shell to a fine powder and titrates it to the endpoint with 302. mL of 0.210M hydrogen chloride
(HCI) solution.
The balanced chemical equation for the reaction is:
2HCl(aq) + CO3(aq) → H₂CO3(aq) + 2Cl¯ (aq)
1
What kind of reaction is this?
If you said this was a precipitation reaction, enter the chemical
formula of the precipitate.
If you said this was an acid-base reaction, enter the chemical formula
of the reactant that is acting as the base.
If you said this was a redox reaction, enter the chemical symbol of the
element that is oxidized.
Calculate the mass percent of CaCO3 in the sample. Be sure your
answer has 3 significant digits.
precipitation
O acid-base
O redox
0
0
0
п%
X
Chapter 20 Solutions
Chemistry & Chemical Reactivity
Ch. 20.1 - Prob. 1RCCh. 20.1 - Prob. 2RCCh. 20.2 - Prob. 1RCCh. 20.2 - Prob. 2RCCh. 20.3 - Prob. 1RCCh. 20.3 - Prob. 2RCCh. 20.3 - Prob. 3RCCh. 20.4 - Prob. 1RCCh. 20.4 - Prob. 2RCCh. 20.4 - 3. Which of the following is a renewable energy...
Ch. 20.5 - Prob. 1RCCh. 20.5 - Prob. 2RCCh. 20.6 - Prob. 1QCh. 20.6 - Prob. 1RCCh. 20.7 - Prob. 1QCh. 20.7 - Prob. 2QCh. 20 - In the discussion on the composition of air,...Ch. 20 - Prob. 2PSCh. 20 - Prob. 3PSCh. 20 - Dinitrogen monoxide, N2O (commonly called nitrous...Ch. 20 - Prob. 5PSCh. 20 - Prob. 6PSCh. 20 - Prob. 9PSCh. 20 - Although there are a number of...Ch. 20 - Prob. 12PSCh. 20 - Prob. 13PSCh. 20 - Prob. 14PSCh. 20 - Prob. 15PSCh. 20 - Prob. 17PSCh. 20 - The enthalpy of combustion of isooctane (C8H18),...Ch. 20 - Energy consumption in the United States amounts to...Ch. 20 - Prob. 20PSCh. 20 - Prob. 23PSCh. 20 - Prob. 25PSCh. 20 - Prob. 28PSCh. 20 - In methane hydrate the methane molecule is trapped...Ch. 20 - Prob. 30PSCh. 20 - Prob. 31PSCh. 20 - Prob. 32PSCh. 20 - Prob. 33PSCh. 20 - Prob. 34PSCh. 20 - Prob. 35GQCh. 20 - Prob. 36GQCh. 20 - Prob. 37GQCh. 20 - Prob. 38GQCh. 20 - Prob. 40GQCh. 20 - Prob. 41ILCh. 20 - Prob. 42ILCh. 20 - Define the terms renewable and nonrenewable as...Ch. 20 - Prob. 44SCQCh. 20 - Prob. 45SCQCh. 20 - Prob. 46SCQCh. 20 - Prob. 47SCQCh. 20 - What is the likelihood that hydrogen (H2) will...Ch. 20 - Prob. 49SCQCh. 20 - Which sulfur compounds are atmospheric pollutants?...
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