What is the pH of a 0.020 M RbOH solution?
A)0.020
B)0.040
C)1.70
D)12.30

Name: What is the pH of a 0.020 M RbOH solution? A)0.020 B)0.040 C)1.70 D)12.30
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Quizplus · Accepted Answer

RbOH is a strong base, which means it completely dissociates in water to form Rb+ and OH- ions. The concentration of hydroxide ions in the solution is therefore 0.020 M. 
pH= -log[H+]
Since pOH + pH = 14, pOH = -log[OH-] = -log(0.020) = 1.70
pH = 14 - pOH = 14 - 1.70 = 12.30. Therefore, the pH of the solution is 12.30.

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