Question

How many grams of sodium hydroxide pellets, NaOH, are required to prepare 50 mL
of a 0.15 M solution.

Answer 1

Answer:

$\large \boxed{\text{0.30 g }}$

Explanation:

1. Calculate the moles of NaOH

$\text{Moles of NaOH} = \text{0.050 L solution} \times \dfrac{\text{0.15 mol NaOH}}{\text{1 L solution}} = \text{0.0075 mol NaOH}$

2. Calculate the mass of NaOH

$\text{Mass of NaOH } = \text{0.0075 mol NaOH } \times \dfrac{\text{40.00 g NaOH }}{\text{1 mol NaOH }} = \textbf{0.30 g NaOH}\\\\\text{You need \large \boxed{\textbf{0.30 g of NaOH}} to prepare the solution}$