Homework Answers
(a)
Vaporisation of water at 1000C,
deltaH = + ve
deltaG = 0 SInce at this state the system is at equilibrium.
(b)
Vaporisation of water at above 1000C
deltaH = + ve
deltaG = - Ve
****
New, [Pb2+] = 0.000220 * 75 / 110 = 0.000150 M
[CrO42-] = 0.00250 * 35 / 110 = 0.000795 M
Solubility equation,
PbCrO4 (s) 
Pb2+(aq.) + CrO42- (aq.)
Solubility product expression,
Qsp = [Pb2+][CrO42-]
Qsp = ( 0.000150 ) * ( 0.000795 )
Qsp = 1.19 * 10-7
Since Q sp > Ksp , precipitation occurrs.
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