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27 January, 22:30

What color did the bromothymol blue indicator turn when it was added to the test tube containing citric acid?

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  1. 27 January, 22:58
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    Yellow bromothymol blue is an indicator solution that is yellow in color for solutions with a pH of 6.0 or lower and blue in solutions with a pH of 7.6 or higher. Since citric acid is an acid, the pH was lower than 6.0 and the solution turned yellow. Pure citric acid has a pH of 2.2.
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