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Edexcel IGCSE Chemistry 2.37 Acids in water

Edexcel IGCSE Chemistry 2.37 Acids in water
Edexcel IGCSE Chemistry syllabusChemistry 4CH1First assessment 2019

Practise predicting observations and word equations when acids react with metals, bases or carbonates to form salts and gases.

How this is tested

  • write word equations for acids reacting with metals, including salt and hydrogen products
  • state observations

Question 6(b)

[Maximum number: 1]

A student uses the reaction between magnesium and dilute hydrochloric acid to prepare crystals of hydrated magnesium chloride.

The student adds excess magnesium powder to hydrochloric acid.
This is the equation for the reaction.

Mg( s)+2HCl(aq)→MgCl2(aq)+H2( g)\mathrm{Mg}(\mathrm{~s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MgCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})

State one observation made during this reaction.