Question

8. Predict whether or not a precipitate will form when 300.0 mL of 0.100 M CuCl2 and 200.0 mL of 0.200 MK2CO3 are mixed. First, determine the formula of the precipitate, and look up its sp.

Answer 1

8 300ml of 0.1M CUCI 300ml xol mol = 30 mmol of CuCl2 20ome of 0.2m K₂CO3 200 mx x 0.2 mol = 90 mmol of Keloz Reaction taking place; CUCI + K₂CO3 - Cucoz t2kci . 1 mol of Cuc I reacts with 1 mol of Kzloz producing Imo of Culoz

Ionic product solubility be ppt. of Cucoz will form hroduct Kse) 30 mmol of cual, will react with 30 mmol of Kalo to give 30mmol of CuCoz lommal of Kzlog left unreacted. How we have lommol of Kaloz in (300+200) 500mL ofsolution Conc. of Kaloz = lommol = 0.02M - 500 mL 2 3o mmol of Culoz in 500ml solution Conc. of Coloz= 30 mmol = 0.06M 500 ML +0.06M Precipitate is : Cucos Ksp 1.4x10 to for ppt to form Ionic product must exceed ksp value. [Coupe total = 0.Osm (from celog only [coz tutal = (coz I klozs + [co] Cucoz ł 0.02M = 0.00M I equations; Culoz e Cu²+ + Coz - 1 Kloze 2K+ + (032 ) Calculating tonic froduct (I.p) IP = [103] [027] = 6.08) (0.06) = 4.8 xlo 3