Calculate the pH of a 1.0 x 10^-4 M solution of HINOg. Be sure your answer has the correct number of significant figures.
HINOg is a strong acid that dissociates completely in water, forming one hydronium ion (H3O+) and one nitrite ion (NO2-).
The equation for the dissociation of HINOg is as follows:
HINOg → H3O+ + NO2-
Since the initial concentration of HINOg is 1.0 x 10^-4 M and it dissociates completely, the concentration of H3O+ (and thus the hydronium ion concentration) is also 1.0 x 10^-4 M.
The pH of a solution is calculated using the formula: pH = -log[H3O+]
Substitute the concentration of H3O+ into the equation:
pH = -log(1.0 x 10^-4)
pH = -(-4)
pH = 4
Therefore, the pH of a 1.0 x 10^-4 M solution of HINOg is 4.