Kinetics and Equilibrium Question

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Grade 12 Kinetics and Equilibrium

Consider the equilibrium reaction of acid indicator HIn:

HIn

$harr$

$H^(+)$ +

$In^(-)$

$K_(In)$ = Ionization constant of the indicator

Which of the following represents a correctly written expression to calculate the concentration of hydrogen ions?

$[H^(+)] = K_(In)$ [Acid form]
$[H^(+)] = K_(In)$ [Acid form]/[Basic form]
$[H^(+)] = K_(In)$ [Basic form]/[Acid form]
$[H^(+)] = K_(In)$ [Basic form]