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chap-17-2011W-b

# Calculate calculate solubility of pbcl2s in 020m

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Unformatted text preview: Ion Effect: Will Solubility Will Solubility increase or decrease when some Pb2+ ions are added to a solution with undissoved PbCl2 (s)? Calculate Calculate Solubility of PbCl2(s) in 0.20M Pb(NO3)2(aq). Pb(NO aq). PbCl 2 (s) 2 ci cf Pb 2++(aq) + 2Cl - -(aq), K sp = 1.7 × 10 −5 Pb 2 (aq) + 2Cl (aq), 0.20 M 0M ( 0.20 + s ) M 2sM K sp = [ Pb 2+ ][Cl - ]2 = (0.20 + s ) × (2 s ) 2 ≈ 0.20 × 4 s 2 = 1.7 × 10 −5 −3 s = 4.6 × 10 M less than 1.6×10-2M Factors That Affect Solubility (1) Common-Ion Effect Common- Solubility of CaF2 Harmful Algae Blooms May 31, 2007 An excess of nutrients in the water A blue-green algae bloom is threatening the water quality of a lake bluethat provides drinking water for over 5 million people in the city of Wuxi Wuxi, Jiangsu Province Applications CommonApplications of Common-Ion Effect Phosphate ions [PO43-] in natural waters --- algae bloom Remedy: Adding limestone, CaCO3(s), solves the problem Ca3 (PO 4 ) 2 (s) 2+ 3- 3Ca (aq) + 2PO 4 (aq) 3CaCO 3 ( s ) K sp = 4.5 × 10 Ca3 (PO 4 ) 2 (s) K sp =1.2×10 −26 2+ −9 3- 3Ca (aq) + 2PO 4 (aq) + 2 3CO 3 - (aq) Factors That Affect Solubility (2) pH and Solubility 2HF ( aq ) Basic Basic anion pH-Solubility of CaF2 CaF2 (s) Ca 2+ (aq) + 2F - (aq) + 2H + (aq) As [H+] ↑, pH ↓, and solubility ↑. pH pH and So...
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