Question

Compare the solubility of silver chromate in each of the following aqueous solutions: Clear All 0.10 M AgCH3COO 0.10 M Na2CrO4 0.10 M KCH3COO 0.10 M NH4NO3 More soluble than in pure water. Similar solubility as in pure water. Less soluble than in pure water.

Answer 1

Comparing the solubility of silver chromate for the solutions :

`$0.10 \ M \ AgCH_3COO$` ----- Less soluble than in pure water.

`$0.10 \ M \ Na_2CrO_4$` ----- Less soluble than in pure water.

`$0.10 \ M \ NH_4NO_3$` ----- Similar solubility as in the pure water

`$0.10 \ M \ KCH_3COO$` ----- Similar solubility as in the pure water

The silver chromate dissociates to form :

`$AgCrO_4 (s) \rightleftharpoons 2Ag^+ (aq) +CrO_4^(2-)(aq)$`

When 0.1 M of
`$AgCH_3COO^-$` is added, the equilibrium shifts towards the reverse direction due to the common ion effect of
`Ag^+`, so the solubility of
`Ag_2CrO_4` decreases.

Both
`AgCH_3COO` and
`$KCH_3COO$` are neutral mediums, so they do not affect the solubility.