Question 23 of 31 Sapling Learning macmilan learning Assuming 100% dissociation,

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Question 23 of 31 Sapling Learning macmilan learning Assuming 100% dissociation, calculate the freezing point and boiling point of 1.80 m SnCl4(aq). Constants may be found here, Number Number Previous Give Up & View Solution e Check Answer Next 1 The addition of solute causes a depression in freezing point and an elevation in boiling point according to the equations Piere Tis the change in freezing or boiling point, K is a constant specific to the solvent, m is the molal concentration, and i is the number of dissociated ions per formula unit. Note, molality is sometimes represented as b.

Explanation / Answer

Since there is 100% dissociation, i = no.of ions produced.

i = 5 ( 4 Cl- and 1 Sn+4)

Kf = 1.86 °C/m ; Kb = 0.512 °C/m

Tf = 1.86 × 1.80 × 5 = 16.74 °C = 289.74 K

Tf = Tf(old) - Tf(new)

Tf = -33°C - 16.74 °C

Tf = - 49.74°C = 223.26 K

Tb = 0.512 × 1.80 × 5 = 4.608 °C = 277.608 K

Tb = Tb(new) - Tb(old)

Tb = 4.608 + 114.2

Tb = 118.808 °C = 391.808 K

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