Question

Above what Fe? * concentration will Fe(OH), precipitate from a buffer solution that has a pH of 9.00? The K, of Fe(OH), is 4.87x10-17 [Fe?") = OF

Answer 1

Solubility of we know felon)2 - 489x60449 PeCOH)2 Pelts 2010 S 0 0 6 QS kesp= (PEACH = (s) (2002 107479 . 105 Cowin antimalan pH=9.00 men logcut) = 9.00 Cutz 109 We known (Holor) = 1074. Cors= 10th = 10th TH We known that Ka > kop than only pot take place Kq = (rest) Cowy Let assume PeRt Concentration ů se W=C2)C60 sf > 487x6047 00) > 4.87800 Loto take dan → Cad> 4.89867 Rent e 4.87700-17 Heley is strong and so it disociate Completely. cop (41) = 0.0443M Helay = 0.0443M But we know CHCor] = 1014 at RT CHCour Ja Ku at that porskouler Temperature .. at oc 3) Cht) Cow)= 115X10-15 0.0443 Cor) = 115*10-15 - COH)115x1048 0.0443 - 25:95x10-15 por lo964) -69 (25-96200-6) = -44 H4 = -12.585 at sic & 12853 x 10 ChriCoH 5-31 310-14 0-0443 Com) - 531860- ) Cor) 531X80-19 - 0.0443 pow. - LosCoH) = -log (128–53X104) -2-10414 = 11.89