System 3: NaHSO3 and KMnO4 Do three variations: [3A], [3B] & [3C] [3A] Acidic solution In large test tube, 0.1 M NaHSO3 (2 mL) + 3 drops of 0.5 M H₂SO4; then add 10 drops of 0.1 M KMnO4, drop by drop. The sign of reaction will be the loss of the permanganate color. [3B] Slightly basic solution 0.1 M NaHSO3 (2 mL) + 2 drops 1 M NaOH; then add 0.1 M KMnO4 dropwise (about 10 drops). [3C] Strongly basic solution 0.1 M NaHSO3 (2 mL) + 1 mL 6 M NaOH; then add 0.1 M KMnO4 dropwise (about 10 drops). Note two reactions: the first, a color change, is unique to system [3C]; the second, a precipitate, is like that of [3B]. Please write balane redox reaction, hint HSO3- > HSO4-, H2SO4+MnO4-->MnSO4

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System 3: NaHSO3 and KMnO4
Do three variations: [3A], [3B] & [3C]
[3A] Acidic solution
In large test tube, 0.1 M NaHSO3 (2 mL) + 3 drops of 0.5 M H₂SO4; then add 10
drops of 0.1 M KMnO4, drop by drop. The sign of reaction will be the loss of the
permanganate color.
[3B] Slightly basic solution
0.1 M NaHSO3 (2 mL) + 2 drops 1 M NaOH; then add 0.1 M KMnO4 dropwise
(about 10 drops).
[3C] Strongly basic solution
0.1 M NaHSO3 (2 mL) + 1 mL 6 M NaOH; then add 0.1 M KMnO4
dropwise (about 10 drops). Note two reactions: the first, a color change, is
unique to system [3C]; the second, a precipitate, is like that of [3B].
Please write balane redox reaction, hint HSO3-
> HSO4-, H2SO4+MnO4-->MnSO4
Transcribed Image Text:System 3: NaHSO3 and KMnO4 Do three variations: [3A], [3B] & [3C] [3A] Acidic solution In large test tube, 0.1 M NaHSO3 (2 mL) + 3 drops of 0.5 M H₂SO4; then add 10 drops of 0.1 M KMnO4, drop by drop. The sign of reaction will be the loss of the permanganate color. [3B] Slightly basic solution 0.1 M NaHSO3 (2 mL) + 2 drops 1 M NaOH; then add 0.1 M KMnO4 dropwise (about 10 drops). [3C] Strongly basic solution 0.1 M NaHSO3 (2 mL) + 1 mL 6 M NaOH; then add 0.1 M KMnO4 dropwise (about 10 drops). Note two reactions: the first, a color change, is unique to system [3C]; the second, a precipitate, is like that of [3B]. Please write balane redox reaction, hint HSO3- > HSO4-, H2SO4+MnO4-->MnSO4
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