请根据图中 A 、 B 两种固体物质的溶解度曲线,回答下列问题. ( 1 )在 _____ °C 时, A 、 B 两种物质溶解度相同. ( 2 ) t 2 °C 时, 100g 水中溶解 _____ gA 物质恰好达到饱和,该饱和溶液中溶质的质量分数为 _____ ,若要把该饱和溶液稀释成质量分数为 10% 的溶液,应加水 _____ g . ( 3 )将 t 2 °C 时 A 、 B 两种物质的饱和溶液降温至 t 1 °C (其它条件不变),溶质的质量分数保持不变的是 _____ .
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