150 mL of `N/10` HCI are required to react completely with 1.0 g of a sample of lime stone (`CaCO_3`). Calculate the percentage purity of the sample.

Explanation

To solve the problem of calculating the percentage purity of a limestone sample based on its reaction with hydrochloric acid (HCl), we will follow these steps:

### Step 1: Calculate the number of equivalents of HCl used
Given that the normality of HCl is \( \frac{N}{10} \) and the volume is 150 mL, we can find the number of equivalents of HCl.

\[ \text{Normality (N)} = \frac{N}{10} = 0.1 \, \text{N} \]
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