HW 2-3: Question 1

[Shaniya Kerns 4D]

If Ka of a monoproctic weak acid is 2.2 x 10^-6, what is the pH of a 0.13 M solution of this acid?
pH=
does x equal H+ pr OH- and how can I tell the difference?

[rydasomera 1L]

It would equal to H+ since you use the Ka to find the concentration of H+ and the question states Ka which is the acid equilibrium constant

[duketh10]

Hi! When attempting to calculate pH, we are looking to utilize the concentration of acidic properties. Therefore, we know that H+ makes solutions more acidic, and OH- makes solutions more basic, so we would use H+ as x since pH is used to measure the acidity of a solution.
Also, we only use OH- when calculating pOH and you can remember this by looking at the OH in pOH. Hope this helps.