Molarity and Mass

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Sophia_Kiessling_2L
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Molarity and Mass

Postby Sophia_Kiessling_2L » Tue Oct 02, 2018 2:58 pm

How would you find the mass of a compound that is needed to get a certain molarity (when given the molarity and volume)?

charlotte_jacobs_4I
Posts: 63
Joined: Fri Sep 28, 2018 12:29 am

Re: Molarity and Mass

Postby charlotte_jacobs_4I » Tue Oct 02, 2018 3:01 pm

First you take molarity and multiply it by liters. Then you that the value in mols that you are left with and multiply that by grams/mole. Finally you are left with grams.

Schuyler_Howell_4D
Posts: 66
Joined: Fri Sep 28, 2018 12:28 am
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Re: Molarity and Mass

Postby Schuyler_Howell_4D » Tue Oct 02, 2018 3:44 pm

More specifically, take the volume you would like to prepare and multiply that by molarity (moles/liters) which should give you moles. Once you have moles, multiply by the molar mass of the compound (found from adding up the atomic masses). This gives you grams needed to create the solution.

If you need more clarity or an example of this, I found a good link that works through a question pertaining to NaCl (below).

http://dl.clackamas.edu/ch105-04/calculat.htm

Scroll about halfway down to see how they found mass from molarity and volume.


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