Question

I need help with Goal #2 based on the prior to class calculations and the direction.

Goal #2: Measure the pH of a monoprotic acids and its conjugate base Your group will be assigned one of the following conjugate acid/base pairs: a. HCI (1.0 M) - NaCI (58.44 g/mol) 6 Formic Acid (1.0 M) - Sodium Formate (68.01 g/mol) c. Propionic Acid (1.0 M) - Sodium Propanoate (96.06 g/mol) d. Ammonium Chloride (53.49 g/mol)-Ammonia (1.0 M) PRIOR TO CLASS Calculate the amount of your assigned acid and base needed to make 100 mL of a 0.10 M solution. Prepare 0.10 M solutions with volumes of 100 mL of both the assigned acid and its base. For most of the acids (except ammonium) this will involve diluting a 1.0 M solution of the acid (or base in the case of ammonia). For most of the bases (except ammonia) this will involve adding the appropriate mass of the base to a 100 mL volumetric flask and diluting to mark (mix well). Your group will need to determine the appropriate mass for themselves Measure the pH of the acid and its conjugate base.

Answer 1

To calculate pH we need Ka value of formic acid which is not given in the problem..