## Calculating K

Brandon Tao 1K
Posts: 100
Joined: Sat Aug 17, 2019 12:15 am

### Calculating K

Why is water not accounted for in calculating for K?

sbeall_1C
Posts: 109
Joined: Sat Sep 07, 2019 12:17 am
Been upvoted: 1 time

### Re: Calculating K

K does not include pure liquids or solids, merely aqueous solutions and gases!

TarynD_1I
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

### Re: Calculating K

Water is not accounted for when calculating for K because it does not affect the equilibrium of the reaction. Pure solids and pure liquids usually do not affect K and are not included in its calculation expression.

Jeremy_Guiman2E
Posts: 82
Joined: Fri Sep 28, 2018 12:29 am

### Re: Calculating K

Pure liquids and solids don't affect the reactant amount as their concentrations stay the same.

ShastaB4C
Posts: 100
Joined: Thu Sep 26, 2019 12:18 am

### Re: Calculating K

Would there be any solvent in which we would include it in K calculations?

sarahartzell1A
Posts: 56
Joined: Fri Sep 28, 2018 12:17 am

### Re: Calculating K

Water is not accounted for because it is a pure liquid!

Rafsan Rana 1A
Posts: 55
Joined: Sat Aug 24, 2019 12:16 am

### Re: Calculating K

pure liquids and solids, which includes water, are disregarded for the equilibrium expression because they don't have an affect on reactant amount at equilibrium and they don't have a concentrations to be used to calculate k.

Bryan Chen 1H
Posts: 58
Joined: Mon Jun 17, 2019 7:24 am

### Re: Calculating K

water is a pure liquid and a solvent. while it "takes part" in the reaction, the change is so small its negligible

Vivianvelazquez_1J
Posts: 109
Joined: Thu Jul 11, 2019 12:17 am
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### Re: Calculating K

When calculating K water is not accounted for because the molar concentration of pure substances (solids or liquids) does not change in the reaction. Therefore solid and liquids are not included in the K expression.

Sofia Barker 2C
Posts: 101
Joined: Wed Sep 18, 2019 12:21 am

### Re: Calculating K

Water is not accounted for because it is considered a pure liquid. Pure liquids don't undergo a change in concentration during a reaction, so it is not necessary to calculate their equilibrium concentrations.