Question

How many grams of sodium hydroxide pellets, NaOH, are required to prepare 50 mL

of a 0.15 M solution.

Answer 1

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

Step-by-step explanation:

1. Calculate the moles of NaOH

`\text{Moles of NaOH} = \text{0.050 L solution} * \frac{\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 } * \frac{\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}`