Calculate the mass of ascorbic acid (Vitamin C, C₆H₈O₆) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C. K_f = 3.9 K kg mol^-1.

Question

Calculate the mass of ascorbic acid (Vitamin C, C 6 H 8 O 6 ) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C. K f = 3.9 K kg mol -1 .

Philoid · Accepted Answer

Given,

Mass of acetic acid, w₁ = 75 g

Lowering of melting point, ΔT_f = 1.5 K

K_f = 3.9 K kg/mol

Molar mass of ascorbic acid (C₆H₈O₆), M₂ 6 × 12 + 8 × 1 + 6 × 16 = 176 g/mol[1]

We know that,

ΔT_b =

1.5 =

w₂ =

= 5.08 g

Hence,

5.08 g of ascorbic acid is needed to be dissolved.

Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C. Kf = 3.9 K kg mol-1.

Calculate the mass of ascorbic acid (Vitamin C, C₆H₈O₆) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C. K_f = 3.9 K kg mol^-1.