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Sophia Dinh 1D wrote:When do we include H2O and when do we exclude it from the ice table
Hi! H20 is only included in the ICE table and K calculations when it is in the gas or aqueous form. This rule also applies for other reagents. Hope this helps!
Water would not be included in the equilibrium constant (K) if it is in solid or liquid form. Liquids (solvents) and solids are so abundant in a chemical reaction that their molar concentrations do not change significantly during the reaction. Hopefully this reasoning helps a bit :)
Depending on the state/phase of water, we either include or don't include it in the equilibrium constant or reaction quotient. If it is considered a liquid or solid, we would not consider it, similar to other liquids and solids. However, if it is gaseous, we would include it. It would not be aqueous as aqueous is defined as being dissolved in water, and water dissolved in water would just be liquid water.
H20 is unique in that it sometimes plays a role in equilibrium concentrations and other times it does not. When H20 is in a gaseous state, include it in calculations. When H20 is in liquid form, omit it from any concentration equations. This is because liquids do not technically have a concentration and therefore are not included when finding K.
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