The reaction between calcium carbonate (CaCO3) and HCl produces calcium chloride (CaCl2), carbon dioxide (CO2), and water (H2O).What happens when the concentration of hydrogen chloride (HCl) molecules is doubled in this reaction?
CaCO3 + 2HCl → CaCl2 + CO2 + H2O
When the hydrogen chloride concentration doubles, the number of collisions between the reactants (increases, decreases, or remains constant)
, which causes the rate of the forward reaction to (decrease, increase, remain constant)
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It is important in this core practical to use appropriate apparatus to make and record a range of measurements accurately, including mass, time, temperature and volume. This includes the safe use of apparatus, and monitoring chemical changes.
This outlines one way to carry out the practical. Eye protection must be worn.
Aims
To investigate the effect of changing the concentration on the rate of a reaction.
Calcium carbonate reacts with dilute hydrochloric acid:
calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
The volume of carbon dioxide gas produced can be measured using a gas syringe.
Explanation:
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