Which Volume to use for M1

TanveerDhaliwal3G
Posts: 105
Joined: Fri Aug 30, 2019 12:17 am

Which Volume to use for M1

Some questions give you a volume and then take out a smaller volume to produce another solution. When using the equation M1V1=M2V2, which of the two volumes do we use for M1.

Claire Lo 3C
Posts: 55
Joined: Sat Aug 17, 2019 12:18 am

Re: Which Volume to use for M1

The first volume given usually allows you to calculate the molarity. Typically we use the second volume in the calculation.

Frederick Keith_4C
Posts: 65
Joined: Thu Sep 26, 2019 12:19 am

Re: Which Volume to use for M1

Another way to think about what is MI VI and what is M2 V2, you can think of the first set of variables as your stock solution (before dilution) and your second set of variables are a part of your desired solution (after dilution).

Shimei_2F
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am
Been upvoted: 1 time

Re: Which Volume to use for M1

it depends on what the question is asking for. Usually you would use the smaller one

RasikaObla_4I
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: Which Volume to use for M1

V1 is usually the initial volume that you use to create the second molarity, so if you are solving for V2, you use the smaller volume in the equation for M1.

Kaylee Clarke 1G
Posts: 103
Joined: Fri Aug 30, 2019 12:15 am

Re: Which Volume to use for M1

M1 should always be your starting point and M2 is what is produced through the reaction, so when the equation says this is ‘produced’ it is referring to M2.

Bryce Barbee
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

Re: Which Volume to use for M1

I always write M1V1 as MiVi to help me remember that those are the initial volumes and molarity for the problems.