A:15°
B:25°
C:30°
D:10°
Going to the movies is good, ______ I really only like listening to music.
-- What will a science museum be like if you are asked to build one? -- I hope it will like a book.
工业烧碱具有较好的杀菌消毒作用且廉价易得,但工业烧碱中常含有杂质碳酸钠。某科学学习小组同学围绕工业烧碱样品纯度测定问题,展开了讨论与探究。
【原理思路】利用Na2CO3与稀H2SO4反应产生CO2,通过CO2 质量的测定,确定样品中碳酸钠的质量,从而计算样品纯度。