Science — AI-generated practice question

A nettle sting causes a burning sensation because the nettle injects formic acid (methanoic acid) into the skin — an acidic substance. The dock plant leaf is basic (alkaline) in nature.

When rubbed on the affected area, the basic compounds in the dock leaf neutralise the acid injected by the nettle. This acid-base neutralisation reaction reduces the irritation and provides relief from the burning sensation.

This is similar to how acids and bases cancel each other's effects, as bases are known to neutralise acids.

Source: Chapter 2, Introduction / Acids, Bases and Salts

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• The key concept tested is neutralisation: an acid is neutralised by a base.
• Examiners expect you to: (1) identify the nettle sting as acidic, (2) conclude the dock plant is basic/alkaline, and (3) state that neutralisation provides relief.
• The word "suggest" means you must use reasoning — don't just state facts; link the remedy to the chemical nature logically.
• Do not overthink the biology; this is purely a Chemistry (acid-base) application question worth 3 marks, so one point per mark is ideal.