O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2021 · Q221 Mark
Two solutions are prepared. • Solution P is 0.050 mol/dm³ hydrochloric acid. • Solution Q is 0.100 mol/dm³ butanoic acid. A 2 cm strip of magnesium ribbon is put into 100 cm³ of each solution. Fizzing is seen in both solutions but the fizzing is faster in solution P than it is in solution Q. Which statement helps to explain this observation?
AMagnesium reacts with solution P to form a salt, but does not form a salt with solution Q.
BMore particles are dissociated in solution P than are dissociated in solution Q.
CSolution Q contains a stronger acid than solution P.
DThe particles are closer together in solution Q than they are in solution P.
✓ Correct answer
B: More particles are dissociated in solution P than are dissociated in solution Q.
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