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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Imrantarin on November 20, 2018, 04:25:19 AM

Title: Solution
Post by: Imrantarin on November 20, 2018, 04:25:19 AM

Hi I am self studying chemistry and this maybe very basic question to some, I need some assistance.

Stock solution for HCl is 2M.

If I only take 500cm cube solution from the stock solution. Will it have the same molarity or is that going to be different due to the change in volume? There is no water added to my stock solution, just reducing the volume.


Thank you

Title: Re: Solution
Post by: chenbeier on November 20, 2018, 05:50:10 AM

No change. Think you eat one spoon soup or a whole pot. The taste is the same.

Title: Re: Solution
Post by: Corribus on November 20, 2018, 09:43:14 AM

You might look into the distinction between what are called intensive and extensive properties.

https://en.wikipedia.org/wiki/Intensive_and_extensive_properties

Concentration is an intensive property: it does not depend on the amount of the substance that is there. Compare this to mass or volume - extensive properties - which do depend on the amount of substance that is there.

Title: Re: Solution
Post by: jeffmoonchop on November 20, 2018, 11:56:57 AM

If the solution is mixed well enough, you are removing the same total percentage of each component from the total volume. So the volume reduces, but the ratio of each component in the batch and in the aliquot remains the same.

Title: Re: Solution
Post by: Imrantarin on November 20, 2018, 12:42:06 PM

Thank you all

So if I make 2M solution and it was in 2000cm3 container.

If I pour some of that solution into 500cm3 container, am I right in assuming that the molarity of this solution is 2M and it doesn’t depend on volume

Thanks

Title: Re: Solution
Post by: Borek on November 20, 2018, 12:59:37 PM

Yes, that's what you were told.