An aqueous solution of ammonia is found to be basic. This observation can be exp

Question

An aqueous solution of ammonia is found to be basic. This observation can be explained by the net ionic equation A) HNO_3(aq) + H_2O(1) rightarrow NO_3^-(aq) + H_3O^+ (aq). B) NH_4^+ (aq) + H_2O (i) rightarrow NH_3(aq) + H_3O^+(aq). C) NH_3 (eq) + H_2O (l) rightarrow NH_4^+ (aq) + OH^-(aq). D) NO_3^-(aq) + H_2O (l) rightarrow HNO_4(aq) + OH^-(aq). The following set of data was obtained by the method of initial rates for the reaction: (H_3C)_3CBr + OH^- rightarrow (H_3C)_3COH + Br^- what is the order of reaction with respect to ion, OH^-? Determine the rate law and the value of k for the following reaction using the data provided. A) Rate =43 M^-1_s^-1[NO_2][O_3] B) Rate = 430 M^2_s^-1[NO_2]^2[O_3] C) Rate = 227 M^-2.5_s^-1[NO_2][O_3]^2.5 D) Rate = 130 M^-2_s^-1[NO_2][O_3]^2 E) Rate = 1360 M^-2.5_s^-1[NO_2]^2.5[O_3] Commercial cold packs often contain solid NH_4NO_3 and a pouch of water. The temperature of the pack drops as the NH_4NO_3 dissolves in water. Therefore, for the dissolving of in water. A)delta H_soln is negative and delta S_soln may be negative or positive. B) delta H_soln is positive and delta H_soln may be negative or positive. C) delta H_soln is positive and delta S_soln is positive. D) delta H_soln is negative and delta S_soln is positive. An unknown gas occupies a volume of 1.50 Lat 21 degree C and 0.950 atm. If the mass is 2.01 g, what is the molar mass of the gas? (R = 0.0821 atm*L/mol*K) A) 34.0 g/mol B) 69.1 g/mol C) 76.6 g/mol D) 30.7 g/mol E) 19.0 g/mol What is the K_ap for magnesium hydroxide, Mg(OH)_2, if the hydroxide ion concentration in a saturated solution is 0.00016 M? A) K_sp = 4.1 times 10^-12 B) K_sp = 8.2 times 10^-12 C) K_sp = 1.3 times 10^-8 D) K_sp = 2.0 times 10^-12 E) K_sp = 2.6 times 10^-8

Explanation / Answer

Ans 25 . C. NH3 (aq) + H2O(l) ---> NH4+(aq) + OH-(aq)

The ammonia , in its aqueous solution acts as a base by forming weakly acidic ammonium ions and basic hydroxyl ions , so that the overall pH of the solution is high . Its a reversible reaction and not all molecules of ammonia forms ammonium ions and hence the solution behaves as a weak base.

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