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WorksheetsOCR Chemistry A – 5.2.3(a-d) Redox Titrations
Total questions: 13
Worksheet time: 13mins
When balancing redox equations, what species should be used to balance for hydrogens?
(a)
When balancing redox equations, what species should be used to balance for oxygens?
(a)
When balancing redox equations, what species should be used to balance charge?
(a)
When balancing redox equations, in what order should these steps be taken?
balancing redox elements
balancing oxygens
balancing hydrogens
balancing charge
When balancing half-equations, electrons should be added to...
the side with the reducing agent on it
the side with the most positive charge
the side with the most negative charge
the side with the H+ on
The colour change across the end point for an Fe2+/MnO4– titration
(where permanganate is in the burette)
is (a) to (b)
To convert a redox equation into alkali conditions,
(a) need to be added to (b)
The ratio of
MnO4– : Fe2+
is...
(a)
The ratio of
I2 : S2O32–
is...
(a)
Iodine/thiosulfate titrations are usually used to analyse something that is not iodine.
The thing being analysed must be an...
(a)
Which is the BEST answer?
"Explain why excess iodide must be added to the sample before the iodine/thiosulfate titration."
to ensure the copper is oxidised
to reduce the Cu2+ in the sample
so that all the Cu2+ ions react
so that all the sample is reacted
so that the solution goes blue-black
Match the following colours
blue-black
I2(aq) low concentration
brown
starch(aq) + I2
colourless
I2(aq) high concentration
pink
MnO4–
pale yellow
starch(aq) + I–
Which colour is the odd one out?
brown
pale yellow
blue-black
pink
colourless
