\(\rm{KNO_{3}}\)和\(\rm{KCl}\)在不同温度时的溶解度如表所示\(\rm{.}\)请回答下列问题:
温度\(\rm{/℃}\) | \(\rm{0}\) | \(\rm{10}\) | \(\rm{20}\) | \(\rm{30}\) | \(\rm{40}\) | \(\rm{50}\) | \(\rm{60}\) | \(\rm{70}\) |
溶解度\(\rm{/g}\) | \(\rm{KNO_{3}}\) | \(\rm{13.3}\) | \(\rm{20.9}\) | \(\rm{31.6}\) | \(\rm{45.8}\) | \(\rm{63.9}\) | \(\rm{85.5}\) | \(\rm{110}\) | \(\rm{138}\) |
\(\rm{KCl}\) | \(\rm{27.6}\) | \(\rm{31.0}\) | \(\rm{34.0}\) | \(\rm{37.0}\) | \(\rm{40.0}\) | \(\rm{42.6}\) | \(\rm{45.5}\) | \(\rm{48.3}\) |
\(\rm{(1)}\)依据上表数据,已绘制出\(\rm{KNO_{3}}\)和\(\rm{KCl}\)的溶解度曲线如图,图中能表示\(\rm{KNO_{3}}\)溶解度曲线的是 ______ \(\rm{.(}\)填“\(\rm{m}\)”或“\(\rm{n}\)”\(\rm{)}\)
\(\rm{(2)}\)由表中数据和右图分析可知,\(\rm{KNO_{3}}\)和\(\rm{KCl}\)在某一温度时具有相同的溶解度\(\rm{s}\),则\(\rm{s}\)的取值范围是 ______ .
\(\rm{(3)10℃}\)时,\(\rm{131g}\)饱和\(\rm{KCl}\)溶液,蒸发\(\rm{10g}\)水后,再降温到\(\rm{10℃}\),可析出\(\rm{KCl}\)晶体的质量为 ______ \(\rm{g}\).
\(\rm{(4)}\)某\(\rm{KNO_{3}}\)晶体中有少量\(\rm{KCl}\)、\(\rm{Ca(OH)_{2}}\)杂质,要得到纯净\(\rm{KNO_{3}}\)的方法是:先加热溶解,然后 ______ ,过滤、洗涤、干燥后得到\(\rm{KNO_{3}}\)晶体.