Siddharth B. answered • 03/29/20

You needed to use the molarity formula: moles of solute/Liters of solution to find how many moles of solute you needed.

You correctly converted 500 mL to 0.5 L.

Now, we can put the information we already have into the formula.

We want a solution with 0.1 M.

So, we will do 0.1=x/0.5; 0.1*0.5

Solving for x, we find that we need 0.05 moles of solute NaOH.

As you found, the molar mass of NaOH is 40 g. So, we will do 40 g*0.05, which is about 2 g.

Ayilumo J.

11/15/15