## Quiz 1, Preparation 2, Q1

Ashley Bertholf 1E
Posts: 10
Joined: Fri Jul 15, 2016 3:00 am

### Quiz 1, Preparation 2, Q1

Hi! For this question
"How many grams of NaOH do you need to prepare a 3.0 x 10^2 mL stock solution of 2.00 M NaOH?
How does the set up begin for this?

Britney Pheng 1L
Posts: 22
Joined: Wed Sep 21, 2016 2:56 pm
Been upvoted: 1 time

### Re: Quiz 1, Preparation 2, Q1

Hi Ashley!

To set up this problem you want to use the Molarity equation: $\mathit{M} = \frac{\mathit{n}}{V}$ (Molarity = moles of solute/Liters of solution).

We are given the Molarity (2 M NaOH) and the volume (.3 L) and we must solve for the moles of solute (NaOH). $\mathit{2 M} = \frac{\mathit{n}}{.3 L}$

Once we get our n, moles of NaOH, we can then find out how many grams we need by multiplying the moles by the molar mass of NaOH (39.997 g/mol NaOH).

Hope this helps!