Freezing Point Depression

Question

Calculate the freezing point of a solution containing 600 g of chloroform and 42.0 g of eucalyptol (C10H18O), a fragrant substance found in the leaves of eucalyptus trees. Chloroform has a normal freezing point of -63.5oC and a Kf value of 4.68 oC/m.

Answer 1

(𝟒𝟐.𝟎 𝒈)(𝟏 𝒎𝒐𝒍𝟏𝟓𝟒.𝟏𝟕 𝒈)=𝟎.𝟐𝟕𝟐 𝒎𝒐𝒍 𝑬𝒖𝒄𝒐𝒍𝒚𝒑𝒕𝒐𝒍 Δ𝑻= 𝒌𝒇𝒊𝒎

(𝟎.𝟐𝟕𝟐 𝒎𝒐𝒍 𝑬𝒖𝒄𝒐𝒍𝒚𝒑𝒕𝒐𝒍𝟎.𝟔 𝒌𝒈 𝑪𝒉𝒍𝒐𝒓𝒐𝒇𝒐𝒓𝒎)=𝟎.𝟒𝟓𝟒 𝒎 𝑻𝒔𝒐𝒍𝒗𝒆𝒏𝒕−𝑻𝒔𝒐𝒍𝒖𝒕𝒊𝒐𝒏=𝒌𝒇𝒊 𝒎

−𝑻𝒔𝒐𝒍𝒖𝒕𝒊𝒐𝒏=𝒌𝒇𝒎−𝑻𝒔𝒐𝒍𝒗𝒆𝒏𝒕

−𝑻𝒔𝒐𝒍𝒖𝒕𝒊𝒐𝒏=(𝟒.𝟔𝟖℃𝒎)(𝟎.𝟒𝟓𝟒 𝒎)−(−𝟔𝟑.𝟓℃)

−𝑻𝒔𝒐𝒍𝒖𝒕𝒊𝒐𝒏= +𝟔𝟓.𝟔𝟐 ℃

𝑻𝒔𝒐𝒍𝒖𝒕𝒊𝒐𝒏= −𝟔𝟓.𝟔𝟐 ℃