what is the melting point of a solution in which 3 grams of sodium chloride is...
what is the melting point of a solution in which 3 grams of sodium chloride is added to 170 ml of water? The cryoscopic constant of water is Kf=1.86Kkgmol-1.
Homework Answers
we have to use the formula
delta T = m x kf x i
m = molality we need to calculate
moles of NaCl = 3 / 58.45 = 0.0513
molality = 0.0513 / 0.17 Kg water
= 0.3019 molal
NaCl can dissociate in to Na+ + Cl- so want haf facter i = 2
put all the values in above equation
delta T = 0.3019 x 1.86 x 2
delta T = 1.1231
1.1231 lesser than zero that means
T = 0-1.1231
= -1.1231 ºC
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