# Acid-Base Equilibria (Worksheet)

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Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

### Q1

Calculate the equilibrium concentrations and pH for a 0.20 M proprionic acid solution. $$K_a = 1.3 \times 10^{-5}$$

### Q2

Calculate the equilibrium concentrations and pH for a 0.20 M carbonic acid solution. Compare the answer to problem 1. Note which has the higher $$K_a$$ and lower pH. $$K_a = 4.2 \times 10^{-7}$$

### Q3

Calculate the $$K_a$$ for a 0.3 M solution of $$HA$$ (weak acid) if the pH = 3.65

### Q4

Calculate the pH for a 0.2 M pyridine solution. $$K_b = 2.0 \times 10^{-9}$$

### Q5

Calculate the pH of a $$0.34 M HCl$$ solution.