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[实验准备](1)每组5个烧杯,分别装有50克水。(2)托盘天平、温度计。(3)药品:硫酸钠(Na2SO4)、氢氧化钠(NaOH)、氯化钠(NaCl)、硝酸铵(NH4NO3)、硝酸钾(KNO3)。[实验探究](1)查出以上各物质的溶解度,计算并称出50克水中最多溶解各物质的质量。(2)测量出50克水的温度,记录。(3)将称出的各物质分别放入水中,搅拌,再测出溶质溶解后溶液的温度。
[Experimental Preparation] (1) Each set of five beakers, respectively, with 50 grams of water. (2) Pallet balance, thermometer. (3) drugs: sodium sulfate (Na2SO4), sodium hydroxide (NaOH), sodium chloride (NaCl), ammonium nitrate (NH4NO3), potassium nitrate (KNO3). [Experimental study] (1) to find the solubility of the above substances, calculated and said 50 grams of water dissolved most of the quality of the substance. (2) measured the temperature of 50 grams of water, record. (3) Weigh out the substances were placed in water, stirring, and then measured after solute solution temperature.