Post Module Assessment Question

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Paula Dowdell 1F
Posts: 72
Joined: Tue Nov 15, 2016 3:00 am

Post Module Assessment Question

Postby Paula Dowdell 1F » Tue Nov 07, 2017 10:13 pm

Hey! I know the answer to this question is B, but can someone explain to me why A, C, and D are false?

21. When a solution is diluted what is the main concept that one must be aware of?

A. The moles of solute change.

B. The moles of solute stay the same.

C. The volume of solvent stays the same.

D. The molarity of the solution stays the same.

Maeve Gallagher 1J
Posts: 56
Joined: Fri Sep 29, 2017 7:07 am

Re: Post Module Assessment Question

Postby Maeve Gallagher 1J » Tue Nov 07, 2017 10:20 pm

A is wrong bc when a solution is diluted, that means solute is added which changes the concentration, but the amount (moles) of solvent doesn't change.
C is wrong for the same reason -- solute is added which will increase the volume of the solute.
D is wrong because when you are diluting a solution and the volume of solute increases, the concentration (or molarity) of the solution will change since molarity is measured in (moles of solvent)/(volume of solute).

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