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Answers+to+Ch7

014 m ag 2 so4 2 0028 m ksp 0 0282 0

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Unformatted text preview: From (a) assume [HCO 3- ] = 1.000 M , then [H2 CO3] = 0.091 M [H2 CO3 after conversion = 0.091 − (0.15 ×0.091) = 0.077 M [HCO 3- after conversion = 1.000 + (0.15 ×0.091) = 1.014 M [H+ ] = 4. 4×10−7×(0. 077/1. 014)= 3. 34×10−8 M ; pH = 7.48 3 53. pH = 4.50 ; [H+ ] = 3. 2×10−5 M mol Lac− = mol NaLac = (250.0 g)(1 mol/112.1 g) = 2.230 mol [H+ ] = Ka (mol HLac...
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