Question

why is it advisable to allow the apparatus to cool before final volume is taken? ( it's an experiment with a burning candle inside a gas jar with a sodium hydroxide solution in the basin) why is sodium hydroxide solution preferred to water in this experiment? ​

Answer 1

Explanation:

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Answer 2

Answer:

When zinc is added in sodium solution sodium zincate (Na

2

ZnO

2

) is formed along with hydrogen gas.

2NaOH+Zn→Na

2

ZnO

2

+H

2

When burning splint is held near the evolved it continues burning with pop sound indicating evolution of Hydrogen gas.

Same metal i.e Zn reacts with strong acid H

2

SO

4

to give ZnSO

4

Zn+H

2

SO

4

→ZnSO

4

+H

2

↑