Question

Which of the following compounds, when added to water, is most likely to increase the solubility of HgS?

A. KNO3
B. Na2SO4
C. KCl

Answer 1

C. KCl- That is the answer for sure, but I dont want to explain

Answer 2

B.
`Na_2SO_4`

Step-by-step explanation:

Hello,

The solubility of HgS is increased by adding
`Na_2SO_4` due to common ion effect which consists on the effect that the higher solubility of
`Na_2SO_4` has over the HgS as the sulfur-based ions modify the solubility product. In such a way, by adding the sulfate, the equilibrium will be shifted rightwards, therefore the solubility is increased.

Best regards.