Partial structure of ciguatera toxin in shown above. The first steps in characte

Question

Partial structure of ciguatera toxin in shown above. The first steps in characterizing new substances typically involve determining physical properties. In a freezing point experiment, a 126 mg sample of pure ciguatera toxin was dissolved in 5.00 g of carbon tetrachloride (which has a freezing point = -23.0 degree C and a freezing point depression constant = 30.0) and the freezing point of the solution was observed to be -23.69 degree C. From this experiment, calculate the molar mass of ciguatera toxin.

Explanation / Answer

DTf = Kf*m

DTf = Tf0-Tf
= -23-(-23.69) = 0.69
Kf= 30 C/mol
m= molality = 0.69/30 = 0.023 molal
0.023 = 0.126/Mw*1000/5
Mw of ciguatera = 0.126/0.023*1000/5
= 1095.65 g/mol

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