4 • Acids-Base Reactions

South Pasadena  AP Chemistry

Name __________________________ Date ___/___/___ Period ___

4  Acids-Base Reactions 4.3

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QUICK CHECK

Ka Values Hydrofluoric acid Chlorous acid Aniline (phenylamine)

HF HClO2 C6H5NH2

Ka = 7.2 x 10-4 Ka = 1.2 x 10-2 Kb = 3.8 x 10-10

1. Consider the acids, HF, HClO2, and C6H5NH3+. Rank them from weakest to strongest. Weakest

Strongest

Justify using Ka values: 2. Consider solutions of the salts, KF and KClO2. Which solution has the higher pH? _______

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Diprotic Acids 3. Carbonic acid, H2CO3, is a diprotic acid. Write the step-wise dissociation equations for H2CO3. Ka1 = 4.3 x 10-7 Ka2 = 5.6 x 10-11

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Diprotic Acid Calculations 4. What is the [CO32-] in a 0.150 M solution of H2CO3? ___________

5. Calculate the pH of a 0.150 M solution of H2CO3.

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Strengths of Acids 6. Consider the acids: HClO2, HBrO2, HIO2. Rank them from weakest to strongest. Weakest

Strongest

Justification: 7. Consider the acids: HBrO, HBrO2, HBrO3. Rank them from weakest to strongest. Weakest

Strongest

Justification: 8. Consider the acids: HCl, HBr, HI. Rank them from weakest to strongest. Weakest Justification:

Strongest