A farmer treats a field with calcium hydroxide to make it less acidic. When the farmer adds ammonium nitrate fertiliser to the field immediately after the calcium hydroxide, the two substances react. Why does this reaction make the fertiliser less effective?

It makes ammonia gas, so less nitrogen is absorbed by the soil.

It makes an acid, making the soil acidic again.

It makes nitrogen gas, so less nitrogen is absorbed by the soil.

It makes the fertiliser too strong, stopping the plants growing well.

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_s24_qp_11 Year：2024 Question No：18

Answer:

Knowledge points:

7.1.1.1. metals

7.1.1.2. bases

7.1.1.3. carbonates

7.1.10. Define a strong acid as an acid that is completely dissociated in aqueous solution and a weak acid as an acid that is partially dissociated in aqueous solution

7.1.11. State that hydrochloric acid is a strong acid, as shown by the symbol equation,

7.1.12. State that ethanoic acid is a weak acid, as shown by the symbol equation

7.1.2.1. litmus

7.1.2.2. thymolphthalein

7.1.2.3. methyl orange

7.1.3. State that bases are oxides or hydroxides of metals and that alkalis are soluble bases

7.1.4.1. acids

7.1.4.2. ammonium salts

7.1.5.1. litmus

7.1.5.2. thymolphthalein

7.1.5.3. methyl orange

7.1.6. State that aqueous solutions of acids contain

7.1.7. Describe how to compare hydrogen ion concentration, neutrality, relative acidity and relative alkalinity in terms of colour and pH using universal indicator paper

7.1.8. Describe the neutralisation reaction between an acid and an alkali to produce water

A farmer treats a field with calcium hydroxide to make it less acidic. When the farmer adds ammonium nitrate fertiliser to the field immediately after the calcium hydroxide, the two substances react. Why does this reaction make the fertiliser less effective?

Answer:

Knowledge points:

Solution:

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