Concentrated `HCl` is `10N,1000c c` of 1N HCl can be obtained by diluting

Options

A. 1 cc of conc. HCl to 1000 cc
B. 10 cc of conc. HCl to 1000 cc
C. 20 cc of conc. HCl to 1000 cc
D. 100 cc of conc. HCl to 1000 cc

Explanation

To solve the problem of how to obtain 1N HCl by diluting concentrated 10N HCl, we can use the dilution equation:

### Step-by-Step Solution:

1. **Understanding the Given Information**:
- Concentrated HCl is 10N (Normality).
- We want to prepare 1N HCl.
- The final volume (V2) we want to achieve is 1000 cc (or 1 L).

2. **Using the Dilution Formula**:
The dilution formula is given by:
\[ N_1 V_1 = N_2 V_2 \]
Where:
- \( N_1 \) = Normality of the concentrated solution = 10N
- \( V_1 \) = Volume of the concentrated solution we need to find
- \( N_2 \) = Normality of the diluted solution = 1N
- \( V_2 \) = Final volume of the diluted solution = 1000 cc

3. **Substituting the Values into the Equation**:
\[ 10N \times V_1 = 1N \times 1000 \, \text{cc} \]

4. **Solving for \( V_1 \)**:
Rearranging the equation to find \( V_1 \):
\[ V_1 = \frac{1N \times 1000 \, \text{cc}}{10N} \]
\[ V_1 = \frac{1000}{10} \, \text{cc} \]
\[ V_1 = 100 \, \text{cc} \]

5. **Conclusion**:
To prepare 1000 cc of 1N HCl, you need to dilute 100 cc of concentrated 10N HCl.

### Final Answer:
You need to dilute **100 cc** of concentrated HCl to obtain **1000 cc** of 1N HCl.