patino_chm2046_chapter16

Precipitation precipitation rxn agno3aq kclaq agcls

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: d form (HInd) and the conjugate The and base (Ind-) have different colors. Thanks to base have that we can ‘see’ the equivalence point. that HInd(aq) + H2O(liq) ⇄ H3O+ (aq) + Ind-((aq) (aq) Ind aq) HInd phenolphthalein Ac id ­Ba ss e A c id ­Ba e Ind ic a to rs Ind ic a to rs (we a k (we a k a c id ss /b a ss e ss )) a c id /b a e PRECIPITATION REACTIONS PRECIPITATION Solubility of Salts Apply equilibrium principles to Apply (i) acid-base and now……… acid-base (ii) precipitation reactions. precipitation Precipitation rxn: AgNO3(aq) + KCl(aq) → AgCl(s) + KNO3(aq) Ag+ + NO3− + K+ + Cl− → AgCl(s) + K+ + NO3− Ag+(aq) + Cl−(aq) ⇄ AgCl(s) the net ionic eqxn Ksp of AgCl Ag+ Pb2+ Hg22+ Ag+ Pb2+ Hg22+ ClAgCl PbCl2 Hg2Cl2 AgCl PbCl2 Hg2Cl2 Solid at the bottom Solid of beaker of All salts formed in this All experiment are said to be INSOLUBLE and INSOLUBLE form when mixing moderately concentrated solutions of the metal ion with chloride ions. ion Review solubility rules, chapter 4 of tetxbook. Ag+ Pb2+ Hg22+ Ag+ Pb2+ Hg22+ Cl AgCl PbCl22 Hg22Cl2 AgCl PbCl Hg Cl2 Ksp of AgCl Although AgCl is said to be insoluble, it insoluble it dissolves to a SLIGHT extent. dissolves AgCl(s) ⇄ Ag+(aq) + Cl−(aq) AgCl(s) Ag undissolved solid in equilibrium with its ions in solution. When equilibrium has been established, no more When AgCl dissolves and the solution is SATURATED. SATURATED Ag+ Pb2+ Hg22+ Ag+ Pb2+ Hg22+ Cl Cl AgCl PbCl22 Hg22Cl2 AgCl PbCl Hg Cl2 Ksp of AgCl AgCl(s) ⇄ Ag+(aq) + Cl-(aq) When the soln is SATURATED, expt. shows that When SATURATED expt. [Ag+] = 1.67 x 10-5 M. [Ag This is equivalent to the SOLUBILITY of AgCl. This SOLUBILITY of What is [Cl-]? [Cl-] = [Ag+] = 1.67 x 10-5 M, [Cl the same. -based on the stoichiometry, one Cl− per one Ag+ Ag+ Pb2+ Hg22+ Ag+ Pb2+ Hg22+ ClCl AgCl PbCl22 Hg22Cl2 AgCl PbCl Hg Cl2 Ksp of AgCl AgCl(s) ⇄ Ag+(aq) + Cl-(aq) The saturated solution has The [Ag+] = [Cl-] = 1.67 x 10-5 M Use this to calculate Kc Kc = Ksp = [Ag+] [Cl-] A...
View Full Document

Ask a homework question - tutors are online