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Introduction to Oxidation and Reduction

In basic solu...

Question

In basic solution, ${C r O_{4}}^{2 -}$ oxidises ${S_{2} O_{3}}^{2 -}$ to form ${C r (O H)_{4}}^{-}$ and ${S_{2} O_{4}}^{2 -}$ . How many mL (nearest integer) of $0.154$ M ${C r O_{4}}^{2 -}$ are required to react with $40.0$ mL of $0.246$ M ${S_{2} O_{3}}^{2 -}$ ?
[Hint : $0.0154$ M $= 0.154 \times 3$ N ${C r O_{4}}^{2 -}$ and $0.246$ M $= 0.246 \times 8$ N ${S_{2} O_{3}}^{2 -}$ ]

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Solution

The reaction is as follows:
$8 C r O_{4}^{2 -} + 3 S_{2} O_{3}^{2 -} \to 6 S O_{4}^{2 -} + 8 C r (O H)_{4}^{-}$
The normality of $0.154$ M ${C r O_{4}}^{-}$ is $0.154 \times 3$ N.
Similarly, the normality of $0.246$ M ${S_{2} O_{3}}^{2 -}$ solution is $0.246 \times 8$ N.
$N_{1} V_{1} = N_{2} V_{2}$
$V \times 0.154 \times 3 = 0.246 \times 8 \times 40$
$V = 170$ mL.

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Similar questions

Q. In basic medium,

C r O_{4}^{2 -}

S_{2} O_{3}^{2 -}

C r (O H)_{4}^{-}

S O_{4}^{2 -}

. How many mL(nearest integer) of

0.154 M

C r O_{4}^{2 -}

are required to react with

40.0 mL

0.246 M

S_{2} O_{3}^{2 -}

[Hint : 0.0154 M = 0.154 \times 3 N C r O_{4}^{2 -} and 0.246 M = 0.246 \times 8 N S_{2} O_{3}^{2 -}]

Q. In basic medium

C r O_{4}^{2 -}

S_{2} O_{3}^{2 -}

S O_{4}^{2 -}

and itself changes into

C r (O H)_{4}^{-} .

0.154 M C r O_{4}^{2 -}

required to react with

40 m L

0.25 M S_{2} O_{3}^{2 -}

m L

.
(Rounded off to the nearest integer)

Q. In basic medium,

C r O_{4}^{2 -}

S_{2} O_{3}^{2 -}

S O_{4}^{2 -}

and itself changes to

C r (O H)_{4}^{-} .

How many mL of 0.154 M

C r O_{4}^{2 -}

are required to react with 40 mL of 0.246 M

S_{2} O_{3}^{2 -}

Q. In basic medium,

C r O_{4}^{2 -}

S_{2} O_{3}^{2 -}

S O_{4}^{2 -}

and itself changes to

C r (O H)_{4}^{-} .

How many mL of 0.154 M

C r O_{4}^{2 -}

are required to react with 40 mL of 0.246 M

S_{2} O_{3}^{2 -}

Q. A solution of

0.1 M K M n O_{4}

is used for the reaction,

S_{2} O_{3}^{2 -} + 2 M n O_{4}^{-} + H_{2} O ⟶ M n O_{2} + S O_{4}^{2 -} + O H^{-}

. What volume of solution in mL will be required to react with

0.158 g

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

? (in mL as nearest integer)

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