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compound that produces hydroxide ions (OH+) in solution and measures more than 7 on the pH scale
a value that indicated the acidity or alkalinity of a solution on a scale of 0-14, based on the proportion of H+ ions.
compounds that react with acidic and basic solutions and produce certain colors, depending on the solution pH
A small, very toxic molecule made up of three hydrogen atoms and one nitrogen atom; produced by nitrogen fixation and as a metabolic waste product of protein and nucleic acid metabolism.
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