What is the molarity of a solution prepared by dissolving 4g of NaOH in 100mL of solution?

I get that you have to change mL to litres, but I am not sure what formula to use.

1 Answer
Feb 8, 2018

I got 1M1M.

Explanation:

Well, first we have to convert 4g4g of sodium hydroxide into moles.

NaOHNaOH has a molar mass of 40g"/"mol40g/mol.

So here, there exists

(4cancelg)/(40cancelg"/"mol)=0.1mol

Then, molarity is expressed by the equation:

"molarity"="moles of solute"/"liters of solution"

So now, we need to convert 100mL into L.

1L=1000mL

:.100mL=0.1L

Since we have now the desired units, we plug them into the equation.

:."molarity"="0.1mol"/"0.1L"=1mol"/"L=1M

So, the molarity of the solution will be 1M.