Question

A solution is made by mixing 500.0 mL of 0.02558 M Na2HAsO4 with 500.0 mL of 0.03961 M NaOH . Complete the mass balance expressions for the sodium and arsenate species in the final solution.

Answer 1

Na2HAsO4 + NaOH → Na3AsO4 + H2O

Step-by-step explanation:

The arseniate specie (Na2HAsO4) contains 1 proton that is acidic. This acidic proton will react with a base as NaOH to produce water and the related salt. The acid-base reaction is:

H+ + NaOH → H2O + Na+

Now, the arsenate species reacts as follows:

Na2HAsO4 + NaOH → Na3AsO4 + H2O