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Why does adding a suitable amount of slaked lime to acidic soil increase the pH?

Answer and explanation

Correct answer: Slaked lime is basic and reduces acidity

Acidic soil contains acidic substances and therefore has a relatively low pH. Slaked lime is calcium hydroxide, Ca(OH)2, a basic compound that supplies hydroxide ions. These ions neutralise acidic hydrogen ions, producing water, while the calcium component forms salts. With a suitable amount, the acidity decreases and the soil pH rises toward a more suitable range. A is correct; B states the opposite, C is chemically unrelated, and D makes an unsupported claim about removing all salts.

Related tags

Soil PhSlaked LimeNeutralisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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