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Redox Reactions

Which titrant...

Question

Which titrant is used in the Iodometric titration which involves $I_{2}$ ?

K M n O_{4}

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K_{2} C r_{2} O_{7}

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N a_{2} S_{2} O_{3}

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All of them

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Solution

The correct option is C $N a_{2} S_{2} O_{3}$
Iodometry is one of the most important redox titration methods. Iodine reacts directly, fast and quantitively with many organic and inorganic substances. Thanks to its relatively low, pH independent redox potential, and reversibility of the iodine/iodide reaction, iodometry can be used both to determine amount of reducing agents (by direct titration with iodine) and of oxidizing agents (by titration of iodine with thiosulfate).

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Similar questions

0.5

K_{2} C r_{2} O_{7}

K M n O_{4}

K I

I_{2}

100

0.15 N

N a_{2} S_{2} O_{3}

%

K_{2} C r_{2} O_{7}

%

K M n O_{4}

I_{2}

A

I_{2}

i n s i t u

B

K M n O_{4}, K_{2} C r_{2} O_{7}, C u S O_{4}, H_{2} O_{2}

(I_{2})

K_{2} C r_{2} O_{7} + 6 K I + 7 H_{2} S O_{4} \to C r_{2} (S O_{4})_{3} + 4 K_{2} S O_{4} + 7 H_{2} O + I_{2}

2 C u C O_{4} + 4 K I \to C u_{2} I_{2} + 2 K_{2} S O_{4} + I_{2}

I_{2} + N a_{2} S_{2} O_{3} \to 2 N a I + N a_{2} S_{4} O_{6}

0.40 M N a_{2} S_{2} O_{3}

(in mL)

I_{2}

0.04

K I

50 mL

0.20 M C u S O_{4}

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