17-3

1. What is the pH of 0.20M aqueous HF? Ka = 6.8x10^-4
2. What is the pH of 0.0050M aqueous HF? Ka = 6.8x10^-4
3. Which one is more acidic, 0.2MHF or 0.02MHCl?
4. What is the pH of 0.04M of NH₄Cl? Ka=5.6x10^-10
5. A 0.10M solution of lactic acid (HC₃H₅O₃, one acidic hydrogen) has a pH of 2.45. What is the K_a for lactic acid?