(a) Explain why dissolving a precisely known mass of solid NaOH and making the solution up to 250.0 mL in a volumetric flask is not an appropriate way to prepare a standard solution. (b) Identify the most appropriate piece of equipment for collecting precisely 25.0 mL of the dissolved tablet solution. Question 30 continues Question 30 (continued) (c) Calculate the concentration of the standardised NaOH solution.
(a) Explain why dissolving a precisely known mass of solid NaOH and making the solution up to 250.0 mL in a volumetric flask is not an appropriate way to prepare a standard solution. (b) Identify the most appropriate piece of equipment for collecting precisely 25.0 mL of the dissolved tablet solution. Question 30 continues Question 30 (continued) (c) Calculate the concentration of the standardised NaOH solution.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![Question 30
Acetylsalicylic acid is a pain relief medication also known as aspirin. The purity
of an aspirin tablet was determined by titration against a basic standard.
First, the basic solution was standardised by titrating it with a standard solution
of potassium hydrogen phthalate:
KHC&H4O4(aq) + NaOH(aq) → H½O(1) + NaKCsH404(aq)
An average titre of 19.25 mL of the sodium hydroxide solution was required to
reach equivalence with 25.0 mL of 0.0116 M potassium hydrogen phthalate.
One aspirin tablet was weighed and found to have a mass of 0.370 g.
It was dissolved in deionised water and made up to 250.0 mL in a volumetric
flask.
The standardised NaOH solution was titrated against 25.0 mL of the aspirin
solution:
C9H$O4(aq) + NaOH(aq) → H2O() + NaC»H7O4(aq)
The average titre of NaOH that neutralised the aspirin solution was 13.20 mL.
(a) Explain why dissolving a precisely known mass of solid NaOH and making
the solution up
250.0 mL in a volumetric flask is not an appropriate way
to prepare a standard solution.
(b) Identify the most appropriate piece of equipment for collecting precisely
25.0 mL of the dissolved tablet solution.
Question 30 continues
Question 30 (continued)
(c) Calculate the concentration of the standardised NaOH solution.
(d)
Given that the molecular mass of aspirin is 180.158 g mol1, calculate the
purity of the tablet as %w/w.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F24b224fa-ce59-4edc-b61d-d63d9f9d42ae%2F8a09dadd-b435-4129-a950-23f05f23a7d3%2Flach1mk_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Question 30
Acetylsalicylic acid is a pain relief medication also known as aspirin. The purity
of an aspirin tablet was determined by titration against a basic standard.
First, the basic solution was standardised by titrating it with a standard solution
of potassium hydrogen phthalate:
KHC&H4O4(aq) + NaOH(aq) → H½O(1) + NaKCsH404(aq)
An average titre of 19.25 mL of the sodium hydroxide solution was required to
reach equivalence with 25.0 mL of 0.0116 M potassium hydrogen phthalate.
One aspirin tablet was weighed and found to have a mass of 0.370 g.
It was dissolved in deionised water and made up to 250.0 mL in a volumetric
flask.
The standardised NaOH solution was titrated against 25.0 mL of the aspirin
solution:
C9H$O4(aq) + NaOH(aq) → H2O() + NaC»H7O4(aq)
The average titre of NaOH that neutralised the aspirin solution was 13.20 mL.
(a) Explain why dissolving a precisely known mass of solid NaOH and making
the solution up
250.0 mL in a volumetric flask is not an appropriate way
to prepare a standard solution.
(b) Identify the most appropriate piece of equipment for collecting precisely
25.0 mL of the dissolved tablet solution.
Question 30 continues
Question 30 (continued)
(c) Calculate the concentration of the standardised NaOH solution.
(d)
Given that the molecular mass of aspirin is 180.158 g mol1, calculate the
purity of the tablet as %w/w.
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