Which one of the following salt is least soluble in water?

Options

A. `[MX(K_sp = 10^-18)]`
B. `[MY(K_sp = 10^-20)]`
C. `[MZ(K_sp = 10^-70)]`
D. All are equally soluble

Answer

To determine which salt is least soluble in water, we can follow these steps:

### Step 1: Understand the Concept of Solubility Product (Ksp)
The solubility product constant (Ksp) is a measure of the solubility of a salt in water. The lower the Ksp value, the less soluble the salt is in water.

### Step 2: Identify the Salts and Their Ksp Values
List the salts provided in the question along with their respective Ksp values. For example:
- Salt A: Ksp = 1.0 x 10^-5
- Salt B: Ksp = 2.0 x 10^-10
- Salt C: Ksp = 1.0 x 10^-8
- Salt D: Ksp = 5.0 x 10^-4

### Step 3: Compare the Ksp Values
Now, compare the Ksp values of all the salts. The salt with the lowest Ksp value will be the least soluble in water.

### Step 4: Conclusion
From the comparison, identify the salt with the lowest Ksp value. For instance, if Salt B has the lowest Ksp value (2.0 x 10^-10), then Salt B is the least soluble in water.

### Final Answer
The salt that is least soluble in water is Salt B.

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