Question

40. Concentrated aqueous ammonia is added to a solution of copper(II) sulfate. A white precipitate forms. The precipitate dissolves as more ammonia is added, generating an intensely blue solution. Which combination of net ionic equations, in the appropriate order, describes this chemistry?! I Cu?* (aq) + 2OH(aq) Cu(OH)2 (19) II Cu?" (aq) + 2OH(aq) = Cu(OH)2 (8) III Cu(OH)(aq) + 4 NH, (aq) Cu(NH3),?* () + 2OH(aq) IV Cu(OH)2 (8) + 4NH, (aq) Cu(NH3)*(14) + 2OH(aq) V NH3(aq) + H20 (1) NH(aq) + OH(aq) VÌ NH3 (aq) # NH3 (aq) + H (aq) a) V, II, III b) V, II, IV ) VI, I, II d) VI, II, IV 41. In which solution is the percent ionization of formic acid, HCOOH, the lowes? a) 0.20 M HCOOH b) 0.20 M HCOOH that is also 0.10 M NAOH c) 0.20 M HCOOH that is also 0.10 M HCI d) 0.20 M HCOOH that is also 0.10 M NOCI 42. Which oxide reacts with water to form the most basic solution? a) Na:0 b) Alz0, c) SO; ) SO,

Answer 1

I think the answer is option (b). Nhzlu & those, - Nh Ca & Of Fans (V) After that the ionized Cu²tions from cuso, solution realt with otions, then form culo H2 Precipitate. Precipitate is solid. so, curtau + 2016 t culothes . (11) This cuore recent with excess ammonia, CuOH) + 4NH3cau - CUNH) AC + 2 Otraes 2+ So, the order is V, TN.