sSion 1. Identie Discussion 7 1. Which of the following reactions is corect for

Question

sSion 1. Identie Discussion 7 1. Which of the following reactions is corect for C$HSN, and correctly identifies the conjuga A. CsHsN (aq) + H2O (1) CsH4N-(aq) + H30' (aq) B. CsHsN(aq)-H20 (l)CsH6N' (aq)-OH-(aq) C. CsHsN (aq) + H2O (l) CsH4N-(aq) + H30. (aq) D. CsHsN (aq)-H2O (/) CsHaN (aq) + OH (aq) E. CsH5N (aq) + H2O (l) CsH6N+ (aq) + OH-(aq) conjugate- conjugate-op conjugate-HO conjugate = C5H6N conjugate-CAAN+ 2. What is the conjugate base of C&HsCH; COOH? Which of the following solution is/are acidic? 4. The K of HCN is 6.2 * 1010 solve for the Ks of the conjugate base. 5. Solve for the pH of a 0.0986 M solution of NaCN. Please have three decimal places. B. C&HsCH; COO C. C&HsCH; COOH2 a) LiNOs b) Lilo c NH CI d) HNO

Explanation / Answer

1. The correct equation is E. C5H5N(aq) + H2O(l) = C5H6N+(aq) + OH-(aq) . The conjugate is C5H6N+

2. The conjugate base is A. C6H5CH2COO-

3. The solutions of c) NH4Cl and d) HNO2 are acidic.

4. Kb = Kw/ Ka, where Kw is the ionic constant of water= 1*10^-14

Kb= 1*10^-14/ 6.2*10^-10 = 1.613*10^-5

5. Ka of HCN= 4.9*10^-10

Kb= 2.0408*10^-5

Kb= x2/ 0.0986

x= 0.0014

pOH= -logx = -log(0.0014) = 2.854

pH= 11.146

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