Answer to Question #139814 in General Chemistry for Harvey Jed A. Iman

Question #139814
Calculate the freezing point depression of the given electrolytic solution: 5.7 g CaCl2 (calcium chloride) in 18.6 kg H2O (water)
1
Expert's answer
2020-10-28T08:40:19-0400
ΔT=iKCm\Delta T = iKC_m

Cm=n(CaCl2)m(H2O)=m(CaCl2)M(CaCl2)m(H2O)C_m = {n(CaCl_2) \over m(H_2O)} = {m(CaCl_2) \over M(CaCl_2)*m(H_2O)}

ΔT=31.865.711118.6=0.015\Delta T= 3*1.86*{5.7 \over 111*18.6} = 0.015

Tfreezing=0oC0.015oC=0.015oCT_{freezing} = 0^oC-0.015^oC = -0.015^oC


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