Mass of acetic acid, w1 = 75 g Molar mass of ascorbic acid (C6H8O6), M2 = 6 × 12 + 8 × 1 + 6 × 16 = 176 g mol−1 Lowering of melting point, ΔTf = 1.5 K We know that: `triangleT_f = (K_fxxw_2xx1000)/(M_2xxw_1)` `=>w_2=(triangle_fxxM_2xxw_1)/(K_fxx1000)` `= (1.5xx176xx75) /(3.9xx1000)` = 5.08 g (approx) Hence, 5.08 g of ascorbic acid is needed to be dissolved. |