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19. What is [...

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19. What is [CN-] in a solution that contain 0.02 M HCN (Ka = 1.8 X 10 exp.(-5) and 0.01 M HCL ? 1. 8 X 10 exp(-6) 2. 1.8 X 10 exp(-5) 3. 9 X 10 exp(-5) 4. 3.6 X 10 exp (-5)

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