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O CHEMICAL REACTIONS
Solving a redox titration problem
To measure the amount of citric acid
in a certain candy, an analytical chemist dissolves a 13.0 g sample of the candy in 100. mL of water
and titrates this solution to the endpoint with 15.0 mL of 0.140M sodium hydroxide (NaOH) solution.
The balanced chemical equation for the reaction is:
C,H,0(CO,H),(aq) + 30H (aq) → C,H,0(co.) (aq) + 3H,0 (1)
What kind of reaction is this?
If you said this was a precipitation reaction, enter the chemical formula of the
If you said this was an acid-base reaction, enter the chemical formula of the
reactant that is acting as the base.
If you said this was a redox reaction, enter the chemical symbol of the element
that is oxidized.
Calculate the mass percent of C,H,0(CO,H) in the sample. Be sure your
answer has 3 significant digits.