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

Options

A. acetic acid against `NaOH`
B. aniline hydrochloride against `NaOH`
C. sodium carbonate against `HCl`
D. barium hydroxide against oxalic acid

Answer

C

Explanation

`pK_(HIn)=5`
(`a`) `CH_(3)COOH+NaOH`, end point `pHgt7`
(`b`) Aniline hydrochloride `+ NaOH`, end point `pHgt7`
(`c`) `NaHCO_(3)+HCl`, end point `pHlt7`
`Ba(OH)_(2)+H_(2)C_(2)O_(4)`, end point `pHgt7`