Molarity Formula / Calculation

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Yazmin Bocanegra 3L
Posts: 51
Joined: Thu Jul 25, 2019 12:17 am

Molarity Formula / Calculation

Postby Yazmin Bocanegra 3L » Wed Nov 06, 2019 1:03 pm

How do you find molarity? Trying to review for the midterm and I can't seem to grasp it. Thank you for any help you can give me!

Anish Patel 4B
Posts: 59
Joined: Thu Jul 11, 2019 12:17 am

Re: Molarity Formula / Calculation

Postby Anish Patel 4B » Wed Nov 06, 2019 2:07 pm

Molarity is equal to moles of solute per one liter of solution. So if there is a question that tells you there is a certain amount of a compound dissolved into water, you would find the molarity of that solution by using the formula (you might have to convert grams to moles or milliliters to liters). This is also used in the m1v1=m2v2 equation where m1 is initial molarity and v1 is the initial volume of the container that the solution is in.

Indy Bui 1l
Posts: 99
Joined: Sat Sep 07, 2019 12:19 am

Re: Molarity Formula / Calculation

Postby Indy Bui 1l » Wed Nov 06, 2019 2:10 pm

Molarity is Moles/Liters. You can think about it as an amount (moles) that is diluted by a liquid (liters). So in a dilution, only the amount of liters changes and the moles stay constant and you can use the equation m1v1=m2v2. (m being moles and v being volume in liters) . Just be familiar with the concept that it is moles divided by liters.

Doreen Liu 4D
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Joined: Wed Sep 11, 2019 12:17 am

Re: Molarity Formula / Calculation

Postby Doreen Liu 4D » Tue Nov 26, 2019 2:39 pm

The two molarity formula that would be most helpful is: M=n/L and M1V1=M2V2, where n= number of moles, L = liter, M=molarity

Posts: 107
Joined: Sat Aug 17, 2019 12:15 am

Re: Molarity Formula / Calculation

Postby pmokh14B » Tue Nov 26, 2019 3:38 pm

You would either use
or M1V1=M2V2 for dilutions.
Usually, just see which variables you have and manipulate the equations to determine the value you are looking for.

Kishan Shah 2G
Posts: 132
Joined: Thu Jul 11, 2019 12:15 am

Re: Molarity Formula / Calculation

Postby Kishan Shah 2G » Tue Nov 26, 2019 5:00 pm

Try not to get too caught up in the wordiness of the questions. You need to break everything down so you have just moles of whatever atom/compound you want to find the molarity of and the volume of the solution. Then divide the number of moles by the number of liters to get the concentration.

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