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Chemistry library

Lesson 2: Titrations

Introduction to titration

AP.Chem: SPQ‑4 (EU), SPQ‑4.B (LO), SPQ‑4.B.1 (EK)

\ce{2MnO4-}(aq) + \ce{5H2O2}(aq) + \ce{6H+}(aq) \rightarrow \ce{2Mn^2+}(aq) + \ce{5O2}(g) + \ce{8H2O}(l)

The reaction between

\ce{MnO4-}(aq)

and

\ce{H2O2}(aq)

in acidic solution is represented above. In a titration experiment, a 0, point, 020, M solution of

\ce{KMnO4}(aq)

is added from a buret to an acidified sample of

\ce{H2O2}(aq)

in a flask. The endpoint of the titration is determined by the appearance of a faint pink color in the mixture.

Initial buret reading	5, point, 82, space, m, L
Final buret reading	35, point, 82, space, m, L

Based on the data in the table above, how many moles of $\ce{H2O2}(aq)$ were in the sample?

(Choice A)
3, point, 0, times, 10, start superscript, minus, 3, end superscript, space, m, o, l
(Choice B)
1, point, 5, times, 10, start superscript, minus, 3, end superscript, space, m, o, l
(Choice C)
3, point, 0, times, 10, start superscript, minus, 4, end superscript, space, m, o, l
(Choice D)
1, point, 5, times, 10, start superscript, minus, 4, end superscript, space, m, o, l

Stuck?