Chem 1200 Exam 5 Name Chapter 18 &19-Acid/base Equilbrium, buffers, and titratio

Question

Chem 1200 Exam 5 Name Chapter 18 &19-Acid/base Equilbrium, buffers, and titrations 1. Calculate for the following strong acids and bases (3pts each) a. What is the pH of an aqueous solution of 0.873 M nitric acid? What is the hydronium ion concentration in an aqueous hydroiodic acid solution that has a pOH of 10.204? b. c. What is the hydroxide ion concentration in an aqueous solution of hydrochloric acid that has a pH of 1.886 d. What is the pH of an aqueous solution of 3.78 M potassium hydroxide?

Explanation / Answer

1.Nitric acid is strong acid and ionizes completely as

HNO3+ H2O------àH3O++NO3-

Hence [H3O+]= 0.873M

pH= -log [H3O+]= -log (0.873)=0.059

2.

since pH+ pOH= 14

pH= 14-10.204= 3.796

[H+]= 10(-pH)= 10(-3.796)= 0.00016

3.

pH= -log [H+]

[H+]= 10(-pH)= 10(-1.886)=0.0130

4. potasium hydroxide is strong base and ioninzes completely.

[OH-]= 3.78

pOH= -log (3.78)= -0.577

since pH+ pOH= 14

pH= 14-pOH= 14+0.577= 14.577

3.

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