淮安市某盐化厂生产的碳酸钠粗产品中含有少量氯化钠.碳酸钠和氯

淮安市某盐化厂生产的碳酸钠粗产品中含有少量氯化钠.碳酸钠和氯化钠的溶解度与温度的关系如图所示,回答下列问题:

(1)t1℃时碳酸钠与氯化钠中溶解度较大的物质是   

(2)t1℃时碳酸钠饱和溶液升温至t2℃,所得溶液的溶质质量分                 .(填“变大”、“变小”或“不变”).

(3)除去碳酸钠中混有少量氯化钠的方法是        

答案

(1)氯化钠  (2)不变  (3)降温结晶

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