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Salt of Strong Acid and Weak Base

Indicator W...

Question

Indicator $W$ would be suitable for used in the determination of the concentration of acetic acid in white vinegar by base titration.

A

True

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B

False

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Solution

The correct option is B False
The indicator $W$ changes its colour from red to yellow in a $p H$ range of $4.2$ to $5.8$ . The equivalence point of titration of acetic acid with base will be at $p H = 4.7$ and $p H$ $W$ can't change its colour.
Answer will be false.

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Similar questions

Q. For a series of indicators, the colours and pH range over which colour change takes are as follows:

Indicator	Colour change over pH range
U	Yellow to blue pH 0.0 to 1.6
V	Red to yellow pH 2.8 to 4.1
W	Red to yellow pH 4.2 to 5.8
X	Yellow to blue pH 6.0 to 7.7
Y	Colourless to red pH 8.2 to 10.0

Which of the following statements is/are correct?

Q. An acid-base indicator which is a weak acid has a

p K_{a} v a l u e = 5.35

. At what concentration ratio of sodium acetate to acetic acid would the indicator show a colour half-way between those of its acid and conjugate base forms?

p K_{a}

= 4.75. [l o g 2 = 0.3]

.

Q. An acid - base indicator which is a weak acid has a

p H

value = 5.45. At what concentration ratio of sodium acetate to acetic acid would the indicator show a colour half way between those of its acid and conjugate base forms?

p H

of acetic acid = 4.75. log 2 = 0.3]

Q. In vinegar the concentration of acetic acid is nearly:

Vinegar is an acid with its key ingredient, acetic acid. It is widely used for food preservation and cooking. The acetic concentration for table vinegar is typically

5 %

whereas higher concentration upto

18 %

is used as preservative. The word "vinegar" is derived from vin aigre, meaning "sour wine".

A table vinegar sample contains

5 %

(mass/mass) of acetic acid.

10 m L

of the above sample should be diluted to prepare

0.10 M

acetic acid solution. (density

1.05 g m L^{- 1}

, Molar mass of

C H_{3} C O O H - 60.0 g m o l^{- 1}

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Salt of Strong Acid and Weak Base

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