Answered

Write balanced equations for the following chemical
changes.
i. The reaction of sodium metal with ammonia.
[1]
ii. The reaction of sodium hydroxide with carbon dioxide gas. [1]
iii. The reaction of oxalic acid with concentrated sulphuric acid. [1]
iv. How can you prove that hydrogen sulphide gas is used
as analytical reagent?
[2]



Answer :

GinnyAnswer
Sure, I can help you with that.

i. The balanced equation for the reaction of sodium metal with ammonia is:
2 Na + 2 NH₃ → 2 NaNH₂ + H₂

ii. The balanced equation for the reaction of sodium hydroxide with carbon dioxide gas is:
2 NaOH + CO₂ → Na₂CO₃ + H₂O

iii. The reaction of oxalic acid with concentrated sulfuric acid is a bit complex, but a simplified balanced equation can be:
(HOOCCOOH)₂ + 2 H₂SO₄ → 2 (CO)SO₂ + 2 H₂O + CO₂

iv. Hydrogen sulfide gas is used as an analytical reagent because it reacts with various metal ions to form insoluble metal sulfides, which are useful in qualitative inorganic analysis. For example, when hydrogen sulfide gas is passed through a solution containing a metal ion, a colored precipitate of metal sulfide is formed. This precipitate helps identify the presence of specific metal ions based on their unique colors.

I hope this information helps! Let me know if you need further clarification or have any more questions.

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