CAIE IGCSE Chemistry 7.1.4 Characteristic Properties of Bases in Questions

Predict products and observations when bases and alkalis react with acids, ammonium salts and acidic soil or wastewater.

Exam points

predict salt and water when a base neutralises an acid and write the balanced equation
predict ammonia, water and a salt when an alkali is warmed with an ammonium salt
use pH change and indicator colour to identify basic behaviour
use ammonia observations and soil or wastewater contexts to identify base reactions

[Maximum number: 1]

Ammonium nitrate, $\mathrm{NH}_{4} \mathrm{NO}_{3}$ , is a fertiliser and is added to fields to help crops grow.
Slaked lime, $\mathrm{Ca}(\mathrm{OH})_{2}$ , is an alkali and is added to fields to reduce the acidity of the soil.
Ammonium nitrate and slaked lime should not be added to a field at the same time because they react with each other to form a gas, Z.

What is Z ?

ammonia

hydrogen

nitrogen

oxygen

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CAIE IGCSE Chemistry 7.1.4 Characteristic Properties of Bases in Questions question 1