Molarity and Dilution of a Solution

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jordanginyard_
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Molarity and Dilution of a Solution

Postby jordanginyard_ » Sun Oct 11, 2020 11:32 pm

As the volume goes up, does the molarity and the number of moles go down, or does the both remain the same?

Minh Nguyen 3A
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Re: Molarity and Dilution of a Solution

Postby Minh Nguyen 3A » Sun Oct 11, 2020 11:39 pm

To my knowledge, volume and molarity can change in a solution, but the number of moles of any particular compound in that solution will remain the same. For example, adding water to a mixture of water and sodium chloride would increase the volume of the solution, while decreasing the molarity of sodium chloride. However, the moles of sodium chloride will remain constant, it's just that the moles are more "spread out" within the solution, if you will
Essentially, the volume and molarity can change, while the moles will remain constant.

Susanna Givan 2B
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Re: Molarity and Dilution of a Solution

Postby Susanna Givan 2B » Sun Oct 11, 2020 11:52 pm

The number of moles in any liter( or volume) does not change

Eve Gross-Sable 1B
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Re: Molarity and Dilution of a Solution

Postby Eve Gross-Sable 1B » Sun Oct 11, 2020 11:56 pm

Moles will stay the same as long as you do not add more solute. However, say you're adding more water, which will increase the volume, that would decrease the molarity because adding more solvent decreases the concentration. So despite there being the same number of moles, the molarity is less.

Veronica Macias 3K
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Re: Molarity and Dilution of a Solution

Postby Veronica Macias 3K » Mon Oct 12, 2020 1:57 pm

As the volume goes up, does the molarity and the number of moles go down, or does the both remain the same?

Hi, if the volume increases, the molarity decreases and if the volume decreases, the molarity increases. However, for moles, anytime you dilute a solution the moles of the solute remains the same. Moles do not change.

Keeryth Sandhu 1H
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Re: Molarity and Dilution of a Solution

Postby Keeryth Sandhu 1H » Mon Oct 12, 2020 3:15 pm

As volume increases, the molarity will decrease and vice versa for when volume is decreased. However, the number of moles will stay the same.

Kimiya Aframian IB
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Re: Molarity and Dilution of a Solution

Postby Kimiya Aframian IB » Mon Oct 12, 2020 4:09 pm

505422484 wrote:As the volume goes up, does the molarity and the number of moles go down, or does the both remain the same?

Hi! The moles in the solution are not affected by the change in volume-it is completely independent. But the molarity does change because molarity is like a ratio between moles and volume (C=m/v), so increasing volume would cause a lower concentration and decreasing volume would cause a higher concentration.

Audrey Han 3L
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Re: Molarity and Dilution of a Solution

Postby Audrey Han 3L » Mon Oct 12, 2020 4:13 pm

Another way to think about this is that since Molarity=Moles/Liter, you can see that liters and molarity are inversely proportional! So like what others said, when you're adding to the volume or when volume in liters increases, then molarity decreases.


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