Which of the following is not an application of solubility product ?

Options

A. Predicting precipitation formation
B. Predicting solubility of sparingly soluble salt
C. Predicting pH of a buffer solution
D. Qualitative analysis

Answer

To solve the question "Which of the following is not an application of solubility product?", we will follow these steps:

### Step 1: Understand the Concept of Solubility Product (Ksp)
The solubility product, denoted as Ksp, is an equilibrium constant that applies to the solubility of sparingly soluble salts. It is defined for a general salt that dissociates in water. For example, for the dissociation of barium sulfate (BaSO4):

\[ \text{BaSO}_4 (s) \rightleftharpoons \text{Ba}^{2+} (aq) + \text{SO}_4^{2-} (aq) \]

The solubility product expression is given by:

\[ Ksp = [\text{Ba}^{2+}][\text{SO}_4^{2-}] \]

### Step 2: Identify Applications of Solubility Product
The applications of solubility product include:
1. Predicting precipitation (PPT) formation.
2. Predicting the solubility of sparingly soluble salts.
3. Purification of common salt.
4. Qualitative analysis.
5. Calculation of remaining concentration after precipitation.
6. Calculation of simultaneous solubility.

### Step 3: Analyze the Given Options
Now, we will analyze the options provided in the question to identify which one is not an application of the solubility product.

- **Option A**: Predicting precipitation formation - This is a correct application of Ksp.
- **Option B**: Predicting solubility of sparingly soluble salts - This is also a correct application of Ksp.
- **Option C**: Predicting pH of buffer solution - This is NOT an application of Ksp, as the solubility product does not provide information about the pH of buffer solutions.

### Step 4: Conclusion
Based on the analysis, the option that is not an application of the solubility product is **Option C: Predicting pH of buffer solution**.

### Final Answer
**The option that is not an application of solubility product is C: Predicting pH of buffer solution.**

---