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(一)溶解度 一、选择题 1.有3克白色粉末,溶于10克热水中,冷却到室温时析出2克粉末,将析出的2克粉末再溶解于10克热水中,冷却到室温时析出1.5克。据此,可确定白色粉末是( )。 A.纯净物 B.混合物 C.某种盐 D.不能确定 2.在t℃时,取物质A的α%溶液100克,蒸发去p克水,冷却到t℃时析出A的不含结晶水的晶体y克,则A在t℃时的溶解度为
(a) Solubility I. Multiple-choice questions 1. There are 3 grams of white powder dissolved in 10 grams of hot water. When cooled to room temperature, 2 grams of powder are precipitated. The 2 grams of precipitated powder are redissolved in 10 grams of hot water and cooled to 1.5 grams precipitated at room temperature. Based on this, it can be determined that the white powder is (). A. Purity B. Mixture C. Certain salts D. Not sure 2. At t°C, take 100 g of the alpha solution of substance A, evaporate to remove p grams of water, cool to t°C. Precipitate A without crystallization Crystal yg of water, the solubility of A at t°C is