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Get Full Access to Chemistry: The Central Science - 14 Edition - Chapter 20 - Problem 20.18
Get Full Access to Chemistry: The Central Science - 14 Edition - Chapter 20 - Problem 20.18

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# ?For each of the following balanced oxidation-reduction reactions, (i) identify the oxidation numbers for all the elements in the reactants a

ISBN: 9780134414232 1274

## Solution for problem 20.18 Chapter 20

Chemistry: The Central Science | 14th Edition

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Problem 20.18

For each of the following balanced oxidation-reduction reactions,

(i) identify the oxidation numbers for all the elements in the reactants and products and

(ii) state the total number of electrons transferred in each reaction.

(a) $$2 \mathrm{MnO}_{4}^{-}(a q)+3 \mathrm{~S}^{2-}(a q)+4 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow 3 \mathrm{~S}(s)+ 2 \mathrm{MnO}_{2}(s)+8 \mathrm{OH}^{-}(a q)$$

(b) $$4 \mathrm{H}_{2} \mathrm{O}_{2}(a q)+\mathrm{Cl}_{2} \mathrm{O}_{7}(g)+2 \mathrm{OH}^{-}(a q) \longrightarrow 2 \mathrm{ClO}_{2}^{-}(a q)+ 5 \mathrm{H}_{2} \mathrm{O}(l)+4 \mathrm{O}_{2}(g)$$

(c) $$\mathrm{Ba}^{2+}(a q)+2 \mathrm{OH}^{-}(a q)+\mathrm{H}_{2} \mathrm{O}_{2}(a q)+2 \mathrm{ClO}_{2}(a q) \longrightarrow \mathrm{Ba}\left(\mathrm{ClO}_{2}\right)_{2}(s)+2 \mathrm{H}_{2} \mathrm{O}(l)+\mathrm{O}_{2}(g)$$

Text Transcription:

2 MnO4 -(aq) + 3 S2 - (aq) + 4 H2O(l) \longrightarrow 3 S(s) + 2 MnO2(s) + 8 OH-(aq)

4 H2O2(aq) +Cl2O7(g) +2 OH-(aq) \longrightarrow 2 ClO2 -(aq)+ 5 H2O(l) + 4 O2(g)

Ba2+(aq) + 2 OH-(aq) + H2O2(aq) + 2 ClO2(aq) \longrightarrow Ba(ClO2)2(s) + 2 H2O(l) + O2(g)

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