If you have ever made homemade ice cream,you know that you cool the milk and cream by immersing the container in ice and a concentrated solution of rock salt (NaCl) in water.If you want to have a water-salt solution that freezes at -6.°C,how many gr
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If you have ever made homemade ice cream,you know that you cool the milk and cream by immersing the container in ice and a concentrated solution of rock salt (NaCl) in water.If you want to have a water-salt solution that freezes at -6.°C,how many grams of NaCl must you add to 3.0 kg of water?(Assume the van't Hoff factor i for NaCl is 1.85.)
题目的主要意思就是要求使溶液冰点比水下降6度时,需向3kg水中加多少NaCl.可以先求出氯化钠的质量摩尔浓度m.imKf=T(Kf为1.86,T为冰点下降的温度)求出m约为1.74mol/kg.那么3千克的水就需要5.23molNaCl,即约306gNaCl.
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