The formula of sodium zeolite which is used in permutit process for softening water is

Options

A. `Na_(2)O.Al_(2)O_(3).Si_(2)O_(4).xH_(2)O`
B. `Na_(2).Al_(2).Si_(2)O_(4).xH_(2)O`
C. `Na_(2)O.AlO_(3).SiO_(4).xH_(2)O`
D. `K_(2)Al_(2)SiO_(8).xH_(2)O`.

Answer

To find the formula of sodium zeolite used in the permutit process for softening water, we can follow these steps:

### Step 1: Understand the Purpose of Sodium Zeolite
Sodium zeolite is used in the permutit process to remove the permanent hardness of water. Permanent hardness is mainly caused by the presence of calcium and magnesium ions in water.

### Step 2: Identify the Chemical Composition
Sodium zeolite is chemically known as sodium aluminum ortho silicate. It is a type of zeolite that contains sodium ions.

### Step 3: Write the General Formula
The general formula for sodium zeolite can be expressed as:
\[ \text{Na}_2\text{O} \cdot \text{Al}_2\text{O}_3 \cdot y \text{SiO}_2 \cdot x \text{H}_2\text{O} \]
where:
- \( x \) represents the number of water molecules (ranging from 2 to 6)
- \( y \) represents the number of silicon dioxide units (ranging from 2 to 10)

### Step 4: Conclusion
The specific formula for sodium zeolite used in the permutit process is:
\[ \text{Na}_2\text{Al}_2\text{Si}_2\text{O}_8 \cdot x \text{H}_2\text{O} \]
This indicates that sodium zeolite is a hydrated form of sodium aluminum silicate.

### Final Answer
The formula of sodium zeolite used in the permutit process for softening water is:
\[ \text{Na}_2\text{Al}_2\text{Si}_2\text{O}_8 \cdot x \text{H}_2\text{O} \]

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