Question

What is the molarity of a solution prepared by dissolving 33.4 g of sodium chloride in some water and then diluting the solution to a volume of 300.00 mL?

Answer 1

1. Since you must need the value for moles to find the molarity you have to convert 33.4g into moles.

33.4gNaCl / 58.44gNaCl = .572molNaCl

2. Since you cannot use mL to find molarity, you must convert the value into liters by dividing the value by 1000.

300.00 / 1000 = .3L

3. Now plug in your values into the equation. ( M = mol/L) [ Just divide moles by the liters]

M = .572 / .300 = 1.91M OR 1.91mol/L (Units can be M, or mol/L)