PLEASE HELP WITH THESE QUESTIONS! im in desperate need of help. Given K, values

Question

PLEASE HELP WITH THESE QUESTIONS! im in desperate need of help.

Given K, values of 5.6x10-10 and 4.8x10-10 for NH4+ and HCN respectively, calculate the equilibrium 0.86 8.0xl0-11 2.7x10-19 1.2 The pH of 0.10 M of an unknown base is 10.5. Calculate the Kb of ihe base. 3.16 x 10-3 l.0xl0-7 l.0xl0-6 3.16x10-4 Selenious acid (H2SeO3). a diprotic acid, has K1 = 3.0 x 10-3 and K2 = 5.0 x 10-8. What is the [SeO42] of a 0.50 M solution selenious acid? 3.0 xl0-3 5.0 xl0-8 1.5x10-10 3.9xl0-2 What is the pH of a solution in which 25.0 mL of 0.010 M NaOH are added to 10.0 mL of 0.020 M HCl? 11.32 2.68 11.16 10.58 Calculate the pH of a solution prepared by adding 20.0 mL of 0.100 M HC1 to 80.0 mL of a buffer that is comprised and 0.25 M NH4CI. Kb Of NH3 = 1.8 x 10-5. 9.17 4.83 9.67 9.34 Calculate the pH of the solution that results when 30.0 mL of 0.500 M HCOOH is mixed with 30.0 mL of 0.250

Explanation / Answer

23)D

24)C

25)B

26)C

27)C

28)C

29)B

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