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1. What concentration of ammonia is required to have a solution with a pH of 11.35?...

1. What concentration of ammonia is required to have a solution with a pH of 11.35? Kb = 1.8x10-5

2. A 1.81 x 10−3 M solution of quinine, a drug used in treating malaria, has a pH of 9.82. What is the value of Kb? Express your answer in scientific notation, 2 significant figures.

3. A diprotic acid, H2A has the following Kas: Ka1 = 3.13 x 10-7 and Ka2 = 8.93 x 10-11. What is the Kb of HA-?

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