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