To get the mix to freeze at 5oC how many gams of salt(NaCl)is need to add to 5kg of ice bath Kf of water=1.86?

I suppose that you find the grams of NaCl needed to have a f.p. of - 5 掳C





i = 2





5 = 2 x 1.86 x m


m = 1.34 = moles NaCl / 5 Kg


moles = 6.72


Mass = 6.72 x 58.44 g/mol =392.7 g