Question

A solution contains 1.42x10-2 M potassium phosphate and 5.70x10' M sodium chloride. Solid silver nitrate is added slowly to this mixture. A. What is the formula of the substance that precipitates first? formula B. What is the concentration of silver ion when this precipitation first begins? [Ag] = M

Answer 1

solution contain 1.42x10 M 5:10 x103 K ₂ P04 Nace Potassium phosphate Sodium chloride Reaction Jakes place as K₃ P04 (ap.) + AgNO₃ (ap.) Ag P04 (8) Nau (aq) + AgNO₃ (ap.) - Agl (8) Кse a HayPo4 = 8- 841.15 Ksp of Agde = 1.77X16-10 Finding concentration of Agt required for Ag3904 Aga 804 ? 3 Ag+ (aq) + Pop (af) - Ksp = [ngej? [Pop ] 8.8 9x10-17 - Caguy} [1-42x1024) 8.89 410 17 = [Ago]} 1.428102 1.84x10-5M - CAS'] For Age Aga (8) = Agt (al.) +- lal.) Rsp = [Ag+] [ur] 1.77x10-10 = [] [5.7 X1003] 1.77x10-10 - Cagl] 5.70x10 3 3.10x 10-8m = Cagt] The rage) required to precipitate Agce is less than required for Ag3P04 so Age precipitate first [Agt] = 3:10*10%m Answer Cagl]