Answer:
1) pH = 1.0
2) pOH = 6.09
3) pOH = 9.26 ; pOH = 8.88 ; pH = 1.22
Step-by-step explanation:
1) What is the pH of a solution with [H₃O⁺] of 9.1 x 10⁻² M?
pH = -log ( [H₃O⁺] ) = - log (9.1 x 10⁻²) = 1.0
2) What is the pOH of a solution at 25 °C when the pH is 7.91?
pH + pOH = 14
pOH = 14 - pH = 14 - 7.91 = 6.09
3) Which of the following is acidic at 25 °C?
A solution is acidic when the pH is below 7
pOH = 9.26 → pH = 4.72 ACIDIC
pOH = 8.88 → pH = 5.12 ACIDIC
pOH = 6.45 → pH = 7.55
pH = 1.22 ACIDIC
pH = 9.41