A substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. that increases the concentrationA measure of the ratio of the quantity of a substance to the quantity of solvent, solution, or ore. Also, the process of making something more concentrated. of hydroxide ions in aqueousDescribing a solution in which the solvent is water.solutionA mixture of one or more substances dissolved in a solvent to give a homogeneous mixture..
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