Dilution of a sample

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Erika Beltran
Posts: 16
Joined: Fri Sep 26, 2014 2:02 pm

Dilution of a sample

Postby Erika Beltran » Mon Dec 08, 2014 5:05 pm

When a sample is diluted, how does that affect the molarity of the sample? Ie., 150 ml of .02 M of NaCH3CO2 is diluted to .5 L, is the concentration .02 M or does it change because the volume changed?

Niharika Reddy 1D
Posts: 127
Joined: Fri Sep 26, 2014 2:02 pm

Re: Dilution of a sample

Postby Niharika Reddy 1D » Mon Dec 08, 2014 5:23 pm

Dilution changes the molarity because molarity is (moles of solute)/(liters of solution). When a species is diluted, the concentration decreases since there is more volume of solution but the amount of solute remains the same.

To find the new molarity after it is diluted, use the equation: MiVi=MfVf, where the initial conditions (those before dilution: .150L and .02M) and the final volume (.5L) are known, and we can solve for Mf, or final molarity.

Hope this helps!

Erika Beltran
Posts: 16
Joined: Fri Sep 26, 2014 2:02 pm

Re: Dilution of a sample

Postby Erika Beltran » Mon Dec 08, 2014 6:53 pm

This makes a lot of sense! Thank you!


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