k Testing pH Testing pH. Universal indicator left being used to test the pH of a solution centre of sodium hydroxide as hydrochloric acid is added. As the acid is added the indicator in the solution turns green when a neutral pH pH 7 is reached. Stock Photo - Afloimages
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Testing pH Testing pH. Universal indicator  left  being used to test the pH of a solution  centre  of sodium hydroxide as hydrochloric acid is added. As the acid is added the indicator in the solution turns green when a neutral pH  pH 7  is reached.
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Testing pH

Testing pH. Universal indicator (left) being used to test the pH of a solution (centre) of sodium hydroxide as hydrochloric acid is added. As the acid is added the indicator in the solution turns green when a neutral pH (pH 7) is reached.

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