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U3-2-4 - Excess
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Total cards: 5•Content version: v4•Public deck•Updated: 8/1/2026
Card preview (5)
#1
Front (Question)
Excess reactant
Back (Answer)
A reactant of which we have more than the reaction requires more than the molar ratio requires
#2
Front (Question)
Limiting reactant
Back (Answer)
A reactant which is not in excess not enough of it for all of the other reactant to get used up
#3
Front (Question)
Which reactant is used in calculations: excess or limiting?
Back (Answer)
Limiting
#4
Front (Question)
Which kind of reactant should be used in excess: cheap or expensive?
Back (Answer)
Cheap So that all of the expensive reactant gets used up
#5
Front (Question)
Why would we add an excess of a reactant?
Back (Answer)
Any one of: * so that all of the other reactant gets used up * reactant in excess is cheaper than the other reactant(s) * if adding excess acid/alkali, may need acidic/alkaline pH in mixture after reaction.