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(a)
Interpretation:
Concept Introduction:
(a)
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Explanation of Solution
Equilibrium for dissociation of is given as follows:
Value of
Substitute 1.857 for
Equation (2) indicates there is large
Value of
Substitute 7.172 for
Equation (4) indicates there is large
(b)
Interpretation:
Balanced cathodic and anodic half-reactions have to be found.
Concept Introduction:
Cell that is more negatively charge has better oxidation tendency and thus will readily lose electron. Electrons released from this electrode will reach the positive reduction potential electrode.
(b)
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Explanation of Solution
Half cell reaction for reduction of water that occurs at cathode is written as follows:
Half cell reaction for anodic compartment when iodide gets oxidized to triodide ion is written as follows:
(c)
Interpretation:
Balanced reactions amongst
Concept Introduction:
Refer to part (a).
(c)
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Explanation of Solution
Unbalanced reaction is formulated as follows:
Add 3 as coefficient of
Since there are 4
Since there are 3
Finally, verify each side has equal charge. Thus balanced reaction amongst
Unbalanced reaction between
Add 3 as coefficient of
(d)
Interpretation:
Concentration of total sulfite in undiluted wine has to be calculated.
Concept Introduction:
Refer to part (a).
(d)
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Explanation of Solution
Balanced reactions amongst
Balanced reactions amongst
Since
Excess moles of thiosulfate are calculated as follows:
Amount of
Therefore amount of
Number of moles of
Hence, in terms of molar concentration is calculated as follows:
Thus, concentration of total sulfite in undiluted wine is
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EBK EXPLORING CHEMICAL ANALYSIS
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