Phenolphthalein indicator. Phenolphthalein indicator solution added to two test tubes containing sodium hydroxide solutions with different pH values, pH = 9 (left) and pH = 11 (right). Phenolphthalein changes its color depending on the pH of the solution. In acidic solutions it is colorless while in basic solutions it turns into a pinkish violet (fuchsia) color.
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Creative#:
TOP22300931
Source:
達志影像
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RM
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