Question

The first task you are assigned in your summer laboratory job is to prepare a concentrated naoh stock solution. the molecular weight of naoh is 40. how many grams of solid naoh will you need to weigh out to obtain a 750 ml solution that has a concentration of 8 m?

Answer 1

240 g NaOH

Step 1. Calculate the moles of NaOH

Moles of NaOH = 0.750 L solution × (8 mol NaOH/1 L solution) = 6 mol NaOH

Step 2. Calculate the mass of NaOH

Mass of NaOH = 6 mol NaOH × (40 g NaOH/1 mol NaOH) = 240 g NaOH