Question

Calculate the molarity of each of the following 4.00 g of KOH in 4.00 L of a KOH solution

Answer 1

The molarity of a solution is found by dividing the moles of solute by the volume of solution.

In this case we have to use KOH molecular weight to find how many moles of KOH are in 4.00 grams of KOH:

`4.00g\cdot(molKOH)/(56.1g)=0.07molKOH`

There are 0.07moles of KOH, divide this amount by the volume of the solution which is 4.00L:

`M=(0.07mol)/(4.00L)=0.0175M`

It means that the molarity of this solution is 0.0175M.