Writing K expression with or without aq?

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ckilkeary 2G
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Writing K expression with or without aq?

Postby ckilkeary 2G » Wed Jan 08, 2020 4:47 pm

I know that when writing K and Q expressions you don't include molecules in solid and liquid state. But what about aqueous?

Jordan Young 2J
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Re: Writing K expression with or without aq?

Postby Jordan Young 2J » Wed Jan 08, 2020 4:51 pm

You do include molecules that are in an aqueous solution (aq)

Abby Soriano 1J
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Re: Writing K expression with or without aq?

Postby Abby Soriano 1J » Wed Jan 08, 2020 4:55 pm

If the reactants and products are in the aqueous state, then you should include them in your K expression (more specifically in regards to Kc).

Alexandra Bartolome 2H
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Re: Writing K expression with or without aq?

Postby Alexandra Bartolome 2H » Wed Jan 08, 2020 9:23 pm

Reactants and products that are in the aqueous state are included. As the other person said, it's pretty much used with Kc.

Connor Ho 1B
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Re: Writing K expression with or without aq?

Postby Connor Ho 1B » Wed Jan 08, 2020 9:25 pm

Aqueous solutions do contribute to the K expression since those solutions can change in concentration (measurably) over time.

Dina 2k
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Re: Writing K expression with or without aq?

Postby Dina 2k » Wed Jan 08, 2020 10:06 pm

Aqueous solutions are included since it's not a pure liquid. it is present as a water solution, but it may change how it behaves in a reaction. anything labeled as a liquid is a pure substance therefore not included when calculating K. pure liquids and solids have activities that are equal to 1.


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