Question

For preparation of hydrogen gas as shown in the diagram below, [3] a) What would happen i) If we use zinc dust in place of zinc granules. ii) if dilute sulphuric acid is replaced by acetic acid. b) why is soap solution used?​

Answer 1

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1. If in place of zinc granules,some amount of zinc dust is taken in the test tube, then it would result in the formation of hydrogen gas and thus it speeds the reaction rate making it increase
2. Acetic acid is a weak acid whereas sulphuric acid is a strong acid. Weak acid partially dissociates in aqueous solution thereby producing less number of ions compared to strong acid. Therefore electrical conductivity of sulphuric acid is more
3. Soap solution is used to form bubbles of Hydrogen gas, when the evolved Hydrogen gas passes through the soap solution, and when a burning splinter is brought near the bubbles, they burst and Hydrogen gas burns with a pop sound.