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Nicotine, C_10H_14N_2 , has two basic nitrogen atoms and both can react with water to give a basic solution Nic(aq) + H_2O(l) Leftrightarrow NicH^+ (aq) + OH^(-)(aq) NicH^+(aq) + H_2O(l) Leftrightarrow NicH_(2)^(2+) (aq) + OH^(-)(aq) K_(b1)" is "7 xx 10^(-7) and K_(b2)" is "10^(-10) . Calculate the approximate pH of 0.020 M solution.

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You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

(a) You are provided with three test tubes A,B,C which contain distilled water , acidic and basic solutions . If you are given blue litmus paper only , how will you identify the nature of the solutions in three tubes? (b) How will you prove that a given salt is a carbonate of a metal ?