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Chemistry Exam 4, Spring 2005: Solutions and Equilibria - Prof. John D. Watts, Exams of Chemistry

Jackson State University (JSU)Chemistry
Prof. John D. Watts

A chemistry exam from spring 2005, focusing on solutions and equilibria. It includes questions on the formulas of conjugate bases, strong acids, acid-base concepts, ph calculations, balanced equations, solubility equilibria, and the common ion effect.

Typology: Exams

Pre 2010

Uploaded on 08/08/2009

koofers-user-wt2
koofers-user-wt2 🇺🇸

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CHEM 142. Spring 2005 Name:______________________________
Exam 4
SSN (last 4 digits):____________________
Answer all questions. Show your working. Write your answers clearly and legibly.
No credit will be given for illegible and/or ambiguous work.
1. (10 points) Give the chemical formulas of the conjugate bases of the following
acids:
(a) H2SO4
(b) HBr
(c) NH4+
(d) CH3CO2H
(e) HNO2
2. (10 points) Give the chemical formulas of five strong acids.
3. (10 points) Explain the terms “strong acid” and “weak acid”.
pf3
pf4

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Download Chemistry Exam 4, Spring 2005: Solutions and Equilibria - Prof. John D. Watts and more Exams Chemistry in PDF only on Docsity!

CHEM 142. Spring 2005 Name:______________________________ Exam 4 SSN (last 4 digits):____________________ Answer all questions. Show your working. Write your answers clearly and legibly. No credit will be given for illegible and/or ambiguous work.

1. (10 points) Give the chemical formulas of the conjugate bases of the following acids: (a) H 2 SO 4 (b) HBr (c) NH 4 + (d) CH 3 CO 2 H (e) HNO 2 2. (10 points) Give the chemical formulas of five strong acids. 3. (10 points) Explain the terms “strong acid” and “weak acid”.

4. (15 points) Calculate the pH of a 0.320 M aqueous solution of formic acid. [The Ka of formic acid is 1.7 x 10-4]. 5. (15 points) Calculate the pH of a 0.400 M aqueous solution of aniline. [The Kb of aniline is 3.8 x 10-10].

8. (10 points) Calculate the pH of a buffer solution that is 0.400 M in CH 3 CO 2 Na and 0.250 M in CH 3 CO 2 H. [The Ka of CH 3 CO 2 H is 1.8 x 10-5]. 9. (5 points) Use Le Chatelier’s principle to explain the common ion effect on the pH of a solution of a weak acid.