How will you prepare 100 times dilute solution from 1 ml concentrated sulphuric acid solution ? What precaution would you suggest and why ?
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
(a) Which of the metals copper, zinc , magnesium or sodium would be the most suitable ?
(b) Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric acid and concentrated nitric would you choose ? Explain why you would not use the acids you reject.
(c) How would you modify your apparatus to collect dry hydrogen ? Which drying agent would you employ for this purpose ?
What would you observe in the following cases? (i) Sulphur trioxide is dissolved in water on a large scale. (ii) Concentrated sulphuric acid is added to equal volumes of cold water. (iii) 100 ml of 98% sulphuric acid is kept open. (iv) Hot concentrated sulphuric acid is added to sodium chloride crystals. (v) Dilute sulphuric acid is added to ferrous sulphate solution.
Suppose, in your lab, you have run out of dilute Sulphuric acid. You require dilute H2SO4 for an important synthesis but only have concentrated Sulphuric acid, water and a glass beaker. How will you synthesize dilute H2SO4 ?