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# scan0011 - Name ‘"56519 Section 0:66 Date PROBLEMS...

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Unformatted text preview: Name: ‘ "56519 Section: 0 :66 Date: PROBLEMS FOR ASSIGNMENT 3 P 3.1 Consider the preparation of a mixture which contains both M2+ and H0' at fairly low concentration (less than 1 M). From a thermodynamic standpoint, which mixture: (i) [M2+]— — 0 1 and [110“]: 0.01; or, (ii) [ix/12* ]— _ 0 01 and [HO'] = 0.1; gives the better chance to form a precipitate of M(OH)2 ? Why? W VH0”) “'b M“ + 010” RSV EWQEOH“? (i) Rwy; E0le:6.0l:}l: [CT-5‘ 6") REP: EO«OleO.ijQ—= a WJm Mam W a; P 3.2 What evidence has been obtained in Assignment 3 which shows that the B/L basicity of an anion does not necessaril relate to its precipitate- -forming tendencies? WB/L ‘ (gm 0H >Coa’>sotf W 8/1 W é/Mﬁdzgw (3160936 >Ca5m, ski—Fae > Cams Mam @ P 3. 3 Based on work in Assignment 3, explain the outcome of stirring some CaSO 2H 0 in excess 1 M Na C0 for along time. ~~~~~~ M CmCOa @MW M walk/pm Cc‘LSOLt’aI—ala O “714% COLS’Oq' (1143p and. [NH ELCC)?arm/iiiJig/14.1116 .441, -—%> CmCoB 1' so,“ +=lH9f> P 3.4 Based on work in Assignment 3, what is the most sensitive method of testing for Ca2+ by precipitation from solution if (i) the solution is neutral or basic? Why? “PW eff CQ'CO‘B (30.603 W» Mamxﬁm (30.5011, «EM-i6,~ O (1333) “ML C(10)“): (ii) the solution is fairly acidic? Why? may) mmamaw (:4.lo C2130L1 'aHao am (944,06 Mmagcfage w mieleaﬁl-tém dilaurpi‘is‘ 3—23 lo -’-I ...
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