Answer to Question #167270 in General Chemistry for Sachin Murugayya

Question

What is the freezing temperature of an acetic acid/KCl mixture of concentration 0.55m if the Cryoscopic constant for acetic acid is 3.90 °C ·kg/mol and the normal freezing point of acetic acid is 16.6 ^oC? 

Answer 1

$\Delta$ T_f = K_f × m_B

$\Delta T_f$ = 3.90 × 0.55 = 2.14⁰C

(16.6 - T) = 2.14

T = 14.46⁰C