Calculations with equations involving solutions
1 mark · EasyThe balanced equation for the reaction between hydrochloric acid and sodium carbonate is:
If 0.04 mol of sodium carbonate reacts completely, how many moles of hydrochloric acid are required to react with it?
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0.08 mol (±0.005)
Also accept: 0.08; 0.080; 8.0 x 10^-2 mol
Common mistakes: Failing to use correct mole ratio (2:1)
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Marking points
B1 · 1 mark · Correct mole value using 2:1 ratio from equation
Worked solution
From the balanced equation, 1 mol of Na₂CO₃ reacts with 2 mol of HCl.