# What is the mass of the solute in 250 mL of 0.0520 M NaOH solution?

Jun 16, 2016

$\text{Moles of solute"="Volume"xx"Concentration}$;

$\text{Mass of solute"="Moles"xx"Molar mass} .$

#### Explanation:

This relationship is clear dimensionally.

So $\text{moles of solute } =$

$250 \cdot m L \times {10}^{-} 3 L \cdot m {L}^{-} 1 \times 0.0520 \cdot m o l \cdot {L}^{-} 1$

$= 0.0130 \cdot m o l$

We have $0.0130 \cdot m o l$ sodium hydroxide.

The mass of caustic soda is simply this quantity mulitiplied by the molar mass of caustic:

$0.0130 \cdot m o l \times 40.00 \cdot g \cdot m o {l}^{-} 1$ $=$ ??g