Briefly explain why phenophthalein is no...

Briefly explain why phenophthalein is not a suitable indicator when the base is weak acid why methyl orange is not suitable when the acid is weak.

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Which weak acid has the strongest conjugate base ?

Acetic acid `(K_a=1.8xx10^(-5))`

Formic acid `(K_a=1.8xx10^(-4))`

Hydrofluoric acid `(K_a=6.8xx10^(-4))`

Propanoic acid `(K_a=5.5xx10^(-5))`

`pH=1/2pK_w+1/2pK_a+1/2logC`

`pH=1/2pK_w-1/2pK_a-1/2logC`

`pH=1/2pK_w+1/2pK_a-1/2logC`

None of these

Methyl orange

Methyl red

Phenol red

Phenolphthalein