\(\rm{MgSO_{4}}\)和\(\rm{Na_{2}CO_{3}}\)的溶解度表及溶解度曲线如下\(\rm{.}\)下列说法正确的是\(\rm{(}\) \(\rm{)}\)
温度\(\rm{/℃}\) | \(\rm{20}\) | \(\rm{30}\) | \(\rm{40}\) | \(\rm{50}\) | \(\rm{60}\) | \(\rm{70}\) | \(\rm{80}\) |
溶解度\(\rm{S/g}\) | \(\rm{MgSO_{4}}\) | \(\rm{25.1}\) | \(\rm{28.2}\) | \(\rm{30.8}\) | \(\rm{32.9}\) | \(\rm{34.3}\) | \(\rm{35.0}\) | \(\rm{34.9}\) |
\(\rm{Na_{2}CO_{3}}\) | \(\rm{21.5}\) | \(\rm{39.7}\) | \(\rm{49.0}\) | \(\rm{48.5}\) | \(\rm{46.0}\) | \(\rm{45.2}\) | \(\rm{43.9}\) |