The impure 6 g of NaCl is dissolved in water and then...

The impure $6 \mathrm{~g}$ of $\mathrm{NaCl}$ is dissolved in water and then treated with excess of silver nitrate solution. The weight of precipitate of silver chloride is found to be $14 \mathrm{~g}$. The \% purity of $\mathrm{NaCl}$ solution would be: (a) $95 \%$ (b) $85 \%$ (c) $75 \%$ (d) $65 \%$

Key Concepts

Percent Purity Calculation

Percent purity calculation is the process of determining the proportion of a desired substance within an impure sample. This is typically done by comparing the mass of the pure compound obtained through analysis (such as a precipitate in a chemical reaction) to the total mass of the sample, and then converting this ratio into a percentage.

Gravimetric Analysis

Gravimetric analysis is an analytical technique used to determine the quantity of an analyte based on the mass of a solid. In contexts where a reaction produces a precipitate, the mass of that precipitate is measured and used to calculate the amount of the original substance present, provided the reaction stoichiometry is known.

Stoichiometry

Stoichiometry involves calculating the quantitative relationships between reactants and products in a chemical reaction. By using a balanced chemical equation, one can determine the proportions in which substances react and form products, which is essential for interpreting the mass relationships in gravimetric analysis.

Molar Mass

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole. It is a key conversion factor in stoichiometric calculations, allowing the conversion between the mass of a substance and the number of moles, which is crucial for linking mass measurements to chemical quantities in reactions.

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