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12 March, 02:58

Why isn't a ph indicator needed in the lactose broth fermentation tubes?

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  1. 12 March, 05:42
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    A pH indicator indicates whether a solution is acidic or basic. Lactose broth fermentation tubes contains lactose broth, phenol red; which is itself a pH indicator. The phenol red indicator is red at a pH greater than 6.8 and it will turn yellow if the pH is lower than 6.8. So that’s why pH indicator is not needed in lactose broth fermentation tubes.
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