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A 2.0 g piece of magnesium ribbon was added to a known volume of 2.0 M hydrochloric acid - VCE - SSCE Chemistry - Question 1 - 2008 - Paper 1
Question 1
A 2.0 g piece of magnesium ribbon was added to a known volume of 2.0 M hydrochloric acid. The volume of hydrogen gas produced during the reaction was measured and re... show full transcript
Worked Solution & Example Answer:A 2.0 g piece of magnesium ribbon was added to a known volume of 2.0 M hydrochloric acid - VCE - SSCE Chemistry - Question 1 - 2008 - Paper 1
Step 1
a. Write an equation for the reaction between magnesium and hydrochloric acid.
Answer
The chemical reaction between magnesium (Mg) and hydrochloric acid (HCl) can be represented by the following balanced equation:
This equation indicates that one mole of magnesium reacts with two moles of hydrochloric acid to produce one mole of magnesium chloride and one mole of hydrogen gas.
Step 2
b. Sketch the expected graph of volume of hydrogen against time for this second experiment.
Answer
Graph Sketch:
- The graph will illustrate the volume of hydrogen gas produced over time, starting at (0,0) and increasing, likely at a faster rate than the first experiment due to the larger surface area of magnesium powder compared to magnesium ribbon.
Explanation for Graph Shape:
The volume of hydrogen gas will increase rapidly at first due to the increased surface area of magnesium powder, leading to more efficient reaction with hydrochloric acid. This results in a steeper initial slope compared to magnesium ribbon. Over time, as the magnesium is consumed, the rate of gas production will slow down, resulting in a gradual leveling off of the graph as the reaction approaches completion.