If you have ever made homemade ice cream,you know that you cool the milk and cream by immersing the container in ice and
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.)
英語人氣：226 ℃時間：2020-08-14 12:23:17
優(yōu)質(zhì)解答
題目的主要意思就是要求使溶液冰點比水下降6度時,需向3kg水中加多少NaCl.可以先求出氯化鈉的質(zhì)量摩爾濃度m.imKf=T（Kf為1.86,T為冰點下降的溫度）求出m約為1.74mol/kg.那么3千克的水就需要5.23molNaCl,即約306gNaCl.
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