What is the colour of base?
-
A.
Pink with phenolphthalein and yellow with methyl
orange
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B.
Blue with phenolphthalein and yellow with methyl
orange
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C.
Yellow with phenolphthalein and pink with methyl orange
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D.
Yellow with phenolphthalein and blue with methyl orange
Correct Answer:
@.
Explanation:
In a basic environment, the chemical indicators phenolphthalein and methyl orange exhibit distinct color changes that signify the alkalinity of the solution. Phenolphthalein, which remains clear in acidic or neutral conditions, transitions to a vibrant pink or fuchsia color as the pH rises above 8.2. Simultaneously, methyl orange, which appears red in highly acidic environments, shifts to a yellow hue once the pH exceeds 4.4. Consequently, a base is characterized by turning phenolphthalein pink and methyl orange yellow, making option A the correct choice.
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