If a weak acid has a Ka 0f 1.6 x 10-5 , and it is added to water to a concentration of 0.5 M, What is the pH?

where are the choice options?

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l

hypostyle hall;