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Which of these indicators is best suited to distinguish between a solution that has a pH...

Which of these indicators is best suited to distinguish between a solution that has a pH less than 5 and one that has a pH greater than 5?

a. phenolphthalein
b. bromthymol blue
c. methyl red
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Homework Answers

Answer #1

ANSWER:

Indicator function area:

Indicators Acid color pH range of color change Base color
a. phenolphthalein colorless 8.2 - 10.0 pink
b. bromthymol blue yellow 6.0 - 7.6 blue
c. methyl red red 4.8 - 6.0 yellow

We can see in table that only methyl red indicator works in the range of pH less than 5 and pH greater than 5. So, methyl red indicator is best suited to distinguish between a solution that has a pH less than 5 and one that has a pH greater than 5.

Hence, option C is correct.

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