You are given a solution of an alkali. In order to estimate its concentration in terms of normality , you need to know

Options

A. the volume of the solution, the volume of the alkali present in it and its formula weight
B. the mass of the solution, the mass of the alkali present in it and its equivalent weight.
C. the volume of the solution, the solution, the mass of the alkali present in it and its equivalent weight.
D. the mass of the solution, the volume of the alkali present in it and its equivalent weight.

Answer

To estimate the concentration of an alkali solution in terms of normality, we need to follow these steps:

### Step-by-Step Solution:

1. **Understand Normality**:
Normality (N) is defined as the number of gram equivalents of solute per liter of solution. The formula for normality can be expressed as:
\[ N = \frac{\text{Number of gram equivalents}}{\text{Volume of solution in liters}} \]

2. **Identify the Components Needed**:
To calculate normality, we need:
- The volume of the solution (in liters).
- The mass of the alkali (solute).
- The equivalent mass (or equivalent weight) of the alkali.

3. **Calculate the Number of Gram Equivalents**:
The number of gram equivalents can be calculated using the formula:
\[ \text{Number of gram equivalents} = \frac{\text{Mass of alkali}}{\text{Equivalent mass of alkali}} \]

4. **Combine the Information**:
Substitute the number of gram equivalents back into the normality formula:
\[ N = \frac{\frac{\text{Mass of alkali}}{\text{Equivalent mass of alkali}}}{\text{Volume of solution in liters}} \]

5. **Conclusion**:
To determine the normality of the alkali solution, we need:
- The volume of the solution.
- The mass of the alkali present in the solution.
- The equivalent weight of the alkali.

### Final Answer:
To estimate the concentration of the alkali solution in terms of normality, you need:
- Volume of solution
- Mass of alkali present in it
- Equivalent weight of alkali