Suppose you have 49.6 mL of a solution of HF. You titrate it with a 0.10 M solution of Al(OH)3 and use 15.3 mL to reach the endpoint.

Answer 1

What's the rest of the question? Is it to find out the concentration of the HF? Or is it to find out how much HF is left over? Or is it to find the pH? Please re-submit the question in its entirety.