Molarity and Dilution of a Solution:Post-Module Assessment Question 19

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Helen Mejia 1I
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Joined: Fri Sep 28, 2018 12:24 am

Molarity and Dilution of a Solution:Post-Module Assessment Question 19

Postby Helen Mejia 1I » Tue Oct 02, 2018 12:07 pm

Hi, I am having trouble with question 19 from the molarity post-assessment. The question says, calculate the volume of a 0.06 M sodium chloride solution containing 0.03 moles of sodium chloride.

What I did to solve this was using the molarity formula.
Molarity (M)= moles (n)/ volume(v).
since it was asking for the volume, I used: Volume (v)= Molarity/moles -> V= .06/.03, and like that I got 2 Liters. But my answer was wrong.
Please help! thank you (:

Reva Kakaria 1J
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Joined: Fri Sep 28, 2018 12:23 am
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Re: Molarity and Dilution of a Solution:Post-Module Assessment Question 19

Postby Reva Kakaria 1J » Tue Oct 02, 2018 12:11 pm

Hi! When I solve for V using the formula M = n/V, I get V = n/M, so I think you might have accidentally inverted molarity and moles. Then when I do the problem, I get
V = 0.03/0.06, which gives me 0.5 Liters.
I hope this helps!

Helen Mejia 1I
Posts: 67
Joined: Fri Sep 28, 2018 12:24 am

Re: Molarity and Dilution of a Solution:Post-Module Assessment Question 19

Postby Helen Mejia 1I » Tue Oct 02, 2018 12:14 pm

Thank you! I see the mistake I did! I think the answer you got is correct since it was one of the options! (:


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