Question

Calculate the molar solubility of Mg(OH)2 in the following solvents. 8.50×10−2 M MgCl2 Express your answer using two significant figures. 3.75×10−2 M KOH(aq) Express your answer using two significant figures. ksp= 1.8x10^-11

Answer 1

Q: Calculate the molar solubility of Mg(OH), in the following solueria. 8.50 x 10-2M regala and Expren your answer using thro significant figures 3.75 X 10-2M KOH(aq) and Express your answer is ing tuo significant figurno. (kap 21.8x 10-11) Solution: Molar solubility of Mg(OH), in 8.50 x 10-2M MgCl2: Mg (OHD 220 mg o da + 2011aq) 8.5x10-2 (from Mally I of ugat Pritially concentration Change Final [(8.5x10-2) + n] 2n ale know, ing n wort 8.5x18-2 as it has a very small value 1.8x 10-11 2 kop a [Mg2+] ton] ² 1.88 10-11 (8.5x 10-2) tyx (2) { 7 118x10-1 - (8.5x10-2) + 40² & Gu2 1.8.810-11 8.5 x 10-2 18.5x 10-2) x 4 y = 5129x10-11 uz $5.29 X10-11 z 7.27 x 10-6 724806 The molas solubility of Mg(OH)2 in 8.50 x 10-2M MgCl₂ is a (8.5x10-2)tre = (8.5x10-2) + (7.27X10-6) 28.58 10-2 Insignificant figures we corte = 8.5.

Mg(OH) 3.75X10-2 Molar solubility of M9 (oth in 3.75 x 10 2M KOH(aq): - Mg2t +204. Initially 0 Change u an Final (275 x 10-2) + 2x] Alle know, Ksp = [Mg 2+ ] [on] → 18x10" - * * [9-75410-2) + AJ? » 108x10" - RX (375X10-2) * Neglecting an w.site ne (118x10-11) 3.75 x 102, as it has a very small value (3.75X10-272 n = 1.8x 10-11 1:41 x 10-3 z 128 X10-8 The molar solubility of Ma (Oth in 3175x102M KOH Cag) j 1.28 x 1080 In se two significant figunes we can write = 120