Question

What is the molarity of a solution that is prepared by dissolving 61.0g of NaOH in enough water to make 1.50L? @JoannaBlackwelder

Answer 1

Oh, oops. That was for qualified helpers.

Answer 2

Lol, ok.

Answer 3

So, molarity = mol of solute/L of solution

Answer 4

So, we need to find those two quantities

Answer 5

Okay.

Answer 6

So, any ideas on how to find the moles of solute?

Answer 7

Not really.. Do we write the reaction??

Answer 8

No, there is no reaction for this one. It is just dissolving.

Answer 9

To convert from grams to moles, we need to find the molar mass.

Answer 10

Oh bummer. I thought it followed the pattern of the previous ones haha. Alright, so...

Answer 11

Haha, no, molarity is about making solutions, not reactions.

Answer 12

You see how little I really know, then! Haha.

Answer 13

No worries. :-)

Answer 14

So straight into the dimensional analysis?

Answer 15

Yep

Answer 16

Start with the 61g?

Answer 17

Right

Answer 18

Oh right, okay, this is what confused me: in normal dimensional analyses, you don't put anything under the first number, and the last number always ends up on top. But with these, there are places that skip, or they end up on the bottom and I'm confused as to where to put all the numbers.

Answer 19

Hm, I'm not sure what you mean. Can you show me?