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pH

If the equiva...

Question

If the equivalence point is at a pH of 8.4 in an acid-base titration, then _______ indicator should be used.

A

methyl violet

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B

alizarin yellow

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C

phenolphthalein

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D

methyl red

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Solution

The correct option is C phenolphthalein
Acid-base titrations depend on the neutralization between an acid and a base when mixed in solution. In addition to the sample, an appropriate pH indicator is added to the titration chamber, reflecting the pH range of the equivalence point. The acid-base indicator indicates the endpoint of the titration by changing color. If the equivalence point is at a pH of 8.4, then the phenolphthalein indicator would be used.

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In acid-base titration react rapidly to neutralise each other. Equivalence point is a point at which the acid and the base (or oxidising agent and reducing agent) have been added in equivalent quantities. The end point is the point at which the titration stops. Since the purpose of the indicator is to stop the titration close to the point at which the acid and base were added in equivalent quantities, it is important that the equivalent point and the end point be as close as possible. The indicator must change colour at a pH close to that of a solution of the salt of the acid and base. Significantly, the pH changes most rapidly near the equivalence point. The exact shape of a titration curve depends on

K_{a}

K_{b}

of acid and base.

The suitable indicator for the titration is

Q. A strong acid is titrated with weak base. At equivalence point, pH will be

Q. (A) In general phenolphthalein is used as an indicator for the titration of weak acid

(C H_{3} C O O H)

and strong base (NaOH).
(R) At equivalence point solution is basic.

Q. Acid/base indicator with a pK

_{a}

6.8

is Bromothymol blue. During an acid base titration, at what approximate pH, will bromothymol blue undergo a color change?

Q. The equivalence point determined in a acid-base titration always occurs at

p H = 7

. If true write 1, else write 0.

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