Question

# 2. What is the pH and [F–]eq in a 0.100 M solution of HF?      Ans....

2. What is the pH and [F–]eq in a 0.100 M solution of HF?      Ans. pH = 2.08; [F–] = 8.2×10–3 M

3. What would happen to the equilibrium [H3O+] and the pH of the solution if we suddenly added some solid NaF? (Remember, sodium salts are completely soluble in water. How will this change affect the equilibrium system? Which direction will the reaction shift to minimize the disturbance?)

If we suddenly added some solid NaF the solution will result in an increase the concentration of F shifting equation to the left.

4. Determine the pH of 100.0 mL of the solution from 2 after the addition of 0.00500 moles of solid NaF. Assume that the system has re-established equilibrium and that the addition of solid NaF does not change the volume of solution.

Ans. pH = 2.88

5. Would the calculation for 4 be different if we had added 10.0 mL of 0.500 M NaF(aq) instead of solid NaF? What, if anything, would we have had to do differently in our calculations?

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