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Solids and Liquids

Posted: Sun Jan 19, 2020 11:21 am
by 805383532
Why are solids and liquids disregarded when calculating K and Q?

Re: Solids and Liquids

Posted: Sun Jan 19, 2020 12:00 pm
by Kimberly Koo 2I
The change in solvent concentration is insignificant, which is why pure liquids are eliminated from the equilibrium expression.

Re: Solids and Liquids

Posted: Sun Jan 19, 2020 12:20 pm
by William Chan 1D
Solids and liquids are essentially non-compressible, so their concentrations don't really change. Gas concentrations or ion concentrations will change though, those are the values we calculate for.

Re: Solids and Liquids

Posted: Sun Jan 19, 2020 3:19 pm
by Matt F
Most solids and liquids are pure substances, meaning their molar concentration does not change in the reaction. Therefore, it will not affect the equilibrium concentrations of other reactants/products

Re: Solids and Liquids

Posted: Sun Jan 19, 2020 6:42 pm
by Viviana Velasquez
Lavelle mentioned that it had something to do with their concentrations not changing so they were insignificant.

Re: Solids and Liquids

Posted: Sun Jan 19, 2020 7:38 pm
by Chris Charton 1B
Pure solids and liquids do not affect reactant amounts in the equation so they are not included in the equation. If you included them they would have an activity level of 1, thus not changing the equation.

Re: Solids and Liquids

Posted: Sun Jan 19, 2020 8:04 pm
by RobertXu_2J
Because changes to their concentration are inconsequential for the rate of reaction. Solids just sit there, they don't really have a concentration because they don't mix with the solvent. Liquids are the solvent, so you assume that there will always be enough of it that any decrease will be insignificant for the rate of reaction.