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Edexcel IGCSE Chemistry 2.37 Acids in water

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

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

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

2.37 Acid reactions question 1

[Maximum number: 1]

A student uses this apparatus to investigate the rate of reaction between marble chips and dilute hydrochloric acid.

Figure for Question 2.37 Acid reactions question 1 — Edexcel IGCSE Chemistry

The equation for the reaction is

CaCO3+2HCl→CaCl2+H2O+CO2\mathrm{CaCO}_{3}+2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_{2}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}

During the reaction the mass of the contents of the flask decreases.

State why the mass of the contents of the flask decreases.

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