Question

What is the molarity (M) of a solution prepared by dissolving 33.2g of NaOH in water to make 750. Ml solution?

Answer 1

The first step to solve this problem is to use the molecular weight of NaOH to convert the given mass to moles (MW=39.997 g/mol):

`33.2g\cdot(mol)/(39.997g)=0.83mol`

Now, divide this amount by the volume of the solution (in liters):

`M=(0.83mol)/(0.75L)=1.11M`

It means that the correct answer is D. 1.11M.