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When writing out your equilibrium constant, you wouldn't consider liquids and solids present in the reaction since they are pure substances and don't change over the course of the reaction. So when you write out your ICE box, you would only include gases and aqueous products and reactions.
Yes an ICE box is only used for gases and aqueous reagents because they are not pure substances and can change over the course of a reaction. In establishing equilibrium constants, solids and liquids are not used/considered due to the fact that they're pure substances that don't change.
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