What are the two factors investigated to determine their effect on the rate of reaction between hydrochloric acid and marble chips?

  1. Hydrochloric acid concentration
  2. Surface area of marble chips

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How is rate of reaction measured in this practical?

By recording the decrease in mass over time due to the release of carbon dioxide gas.

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What equipment is used to measure the change in mass over time?

A digital mass balance.

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Why is cotton wool placed in the top of the conical flask?

To allow gas to escape while retaining the marble chips and acid.

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What is kept constant when investigating the effect of acid concentration on rate?

The size/surface area of the marble chips.

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What is kept constant when investigating the effect of surface area on rate?

The concentration of the hydrochloric acid.

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What is the role of hydrochloric acid in the reaction with marble chips?

It provides the protons (H+) that react with the carbonate ions in the marble chips.

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What gas is produced when hydrochloric acid reacts with marble chips?

Carbon dioxide.

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What is the independent variable when testing the effect of surface area?

Surface area of marble chips.

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