1st statement
Concentrated sulphuric acid can be used to prepare nitric acid.
2nd statement
Suphuric acid is more volatile than nitric acid.
Would you please tell me why 1st satement is correct and 2nd statement is incorrect?
1993 mc q 45
2010-03-03 3:10 am
回答 (1)
2010-03-03 5:10 am
✔ 最佳答案
Sulphuric acid is a non-volatile acid (boiling point 338°C), while nitric acid is a volatile acid (boiling point 83°C).Sulphuric acid is a non-volatile acid, which can be used to produce volatile acid. For example, nitric acid can be prepared by heating concentrated sulphuric acid with a nitrate salt (e.g. NaNO3).
NaNO3(s) + H2SO4(l) → NaHSO4(s) + HNO3(g)
Such property of sulphuric acid and its related reactions are out of the HKCEE syllabus since 1995.
參考: 老爺子
收錄日期: 2021-05-01 01:02:37
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