Buffer Solutions

1. What is the pH of a solution formed by adding 0.20mol HF and 0.20mol of NaF to enough water to make 1.0L of solution?Ka=6.8x10^-4

2. What is the pH of a solution formed by 0.3M HF and 0.1M HCl?

3. What is the pH of the solution if 0.020mol of NaOH is added to the 1.0L solution formed by adding 0.200mol of HF and 0.200mol of NaF?

4. What is the ratio of HCO₃^- to H₂CO₃ in our blood that has a pH=7.4? K_a1=4.3x10^-7

5. How many grams of NH₄Cl must be added to 1.00L of 0.10M NH₃ to form a buffer that has a pH=9.0? Kb=1.8x10^-5 (Regardless the volume change.)