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 500 mL solution that has a concentration of 10 M?

Question

Quizplus · Accepted Answer

To prepare a 10 M solution, you need 10 moles of NaOH per liter. For 500 mL (0.5 L), you need 5 moles. Since the molecular weight of NaOH is 40 g/mol, you need 5 moles x 40 g/mol = 200 g of NaOH.

The First Task You Are Assigned in Your Summer Laboratory