Question

What is the molarity of a salt solution made by dissolving 250.0 grams of NaCl in 775 mL of solution?

Answer 1

The molarity of a salt solution made by dissolving 250.0 grams of NaCl in 775 mL of solution is 5.52 M .

Explanation:

The molarity of a solution tells one how many moles of solute one can get per liter of solution.One should remember to must convert this volume to liters by using the conversion factor:

1 L = 10³ml

Sodium chloride (NaCl) has a molar mass of 58.44 g per mol , which means that the sample will contain:

   $250 \mathrm{g} \times \frac{1 \text { mole of } \mathrm{Nacl}}{58.44 \mathrm{g}}=4.278 \text { mole of } \mathrm{Nacl}$

This means that the molarity of the solution will be:

$\text {Molarity,c}=\frac{n_{\text {solute}}}{V_{\text {solution }}}=\frac{4.28}{775 \times 10^{-3}}=0.00552 \times 10^{3}=5.52 M$