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Q.

A certain indicator (an organic dye) has pKa = 5. For which of the following titrations may it be suitable.

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a

acetic acid against NaOH

b

aniline hydrochloride against NaOH

c

sodium carbonate against HCl

d

barium hydroxide against oxalic acid

answer is C.

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Detailed Solution

(3)PH range of an indicator is -1 to+1 of PKIn;  so it is suitable for PH<7pKHIn = 5 (a)    CH3COOH + NaOH, end point pH > 7(b) Aniline hydrochloride + NaOH, end point pH > 7(c)  NaHCO3 + HCI, end point pH < 7(d)  Ba(OH)2 + H2C2O4, end point pH > 7
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