The solubility of silver benozate `(PhCOOAg)` in `H_(2)O` and in a buffer solution of `pH = 4,5` and `6` are `S_(1),S_(2),S_(3)`, and `S_(4)`, respectively. Given the decreasing order of their solubilities.

Explanation

To determine the decreasing order of solubility of silver benzoate (PhCOOAg) in water and buffer solutions of different pH values, we can follow these steps:

### Step 1: Understand the Dissociation of Silver Benzoate
Silver benzoate dissociates in water to form benzoate ions (PhCOO⁻) and silver ions (Ag⁺):
\[ \text{PhCOOAg (s)} \rightleftharpoons \text{PhCOO}^- (aq) + \text{Ag}^+ (aq) \]

### Step 2: Write the Expression for Solubility Product (Ksp)
The solubility product constant (Ksp) for the dissociation of silver benzoate can be expressed as:
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