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Question

Give three distinct tests of HCI(apart from using an indicator) to illustrate the typical properties of an acid. [3 MARKS]

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Solution

Each Test: 1 Mark

1) HCI gives hydrogen gas with active metals like Zn, Fe, Mg etc.
Metal+HClMetal chloride+H2Zn+2HClZnCl2+H2Mg+2HClMgCl2+H2

2) With carbonates, HCI gives CO2 gas with brisk effervescence.
Metalcarbonate+HClMetalchloride+H2O+CO2Na2CO3+2HCI2NaCI+H2O+CO2CaCO3+2HCICaCl2+H2O+CO2

3) With metal sulphides like FeS, ZnS etc, HCI gives H2S gas with rotten egg smell.
Metalsulphide+HCI Metalchloride+H2SFeS+2HClFeCl2+H2S

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