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To make a guess you can test.


a standard against which other conditions can be compared in a scientific experiment


compound that donates H+ ions to an aqueous solution and measures less than 7 on the pH scale


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.


saturation with carbon dioxide (as soda water)

reversible reaction

A chemical reaction in which the products re-form the original reactants


the process by which water changes from liquid form to an atmospheric gas

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