Liquids and Solids

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Kimberly 1H
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Joined: Fri Sep 28, 2018 12:17 am
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Liquids and Solids

Postby Kimberly 1H » Sat Jan 12, 2019 3:22 pm

Why aren't reactants and products in the liquid and solid phases not included when calculating K?

Jessica Tsui 1H
Posts: 30
Joined: Fri Sep 28, 2018 12:21 am

Re: Liquids and Solids

Postby Jessica Tsui 1H » Sat Jan 12, 2019 3:25 pm

I think Professor Lavelle said it's because solids and liquids aren't changed in concentration during the reaction.

Kevin Tang 4L
Posts: 83
Joined: Fri Sep 28, 2018 12:28 am

Re: Liquids and Solids

Postby Kevin Tang 4L » Sat Jan 12, 2019 3:34 pm

Solids have a concentration of 1, which doesn't change anything in the equilibrium concentration equation.
For example, C(s)+ O(g) <-> CO(g), if Carbon was included in K because it was, it would be [CO]/[O]*1 which is just [CO]/[O].
You don't want to include the concentration of Carbon though, as it may show a lack of understanding in concentrations.

Hope this helps and correct me if I'm wrong.

305113590
Posts: 66
Joined: Fri Sep 28, 2018 12:28 am

Re: Liquids and Solids

Postby 305113590 » Sat Jan 12, 2019 5:59 pm

Solids and liquids (pure substances) are incompressible and concentration don't change (or change very insignificantly) throughout the reaction. For example, pure water in the liquid or solid phase is 100% water and incompressible. Hence, water doesn't influence the reaction.


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