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Hydrogen Peroxide

In a 50 mL so...

Question

In a $50 m L$ solution of $H_{2} O_{2}$ an excess of $K I$ and dilute $H_{2} S O_{4}$ were added. The $I_{2}$ liberated required $20 m L$ of $0.1 N N a_{2} S_{2} O_{3}$ for complete reaction.
Calculate the strength of $H_{2} O_{2}$ in grams per litre.

0.25 g L^{- 1}

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0.34 g L^{- 1}

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0.68 g L^{- 1}

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0.8 g L^{- 1}

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Solution

The correct option is C $0.68 g L^{- 1}$
$2 K I (a q) + H_{2} S O_{4} (a q) + H_{2} O_{2} (a q) \to K_{2} S O_{4} (a q) + 2 H_{2} O (l) + I_{2} (g)$
$I_{2} (a q) + 2 N a_{2} S_{2} O_{3} (a q) \to N a_{2} S_{4} O_{6} (a q) + 2 N a I (a q)$

$meq. of H_{2} O_{2} in 50 ml = meq. of I_{2} = meq. of N a_{2} S_{2} O_{3}$

$meq. of H_{2} O_{2} in 50 ml = 0.1 \times 20 = 2$

$meq. of H_{2} O_{2} in 1000 ml = \frac{2}{50} \times 1000 = 40$
$Equivalents per litre = \frac{40}{1000} = 0.04$
$Since, eq. weight of H_{2} O_{2} = \frac{34}{2} = 17 ∴ Concentration of H_{2} O_{2} in grams per litre = Equivalents per litre \times eq. weight of H_{2} O_{2}$

$Concentration of H_{2} O_{2} = 0.04 \times 17 g L^{- 1} = 0.68 g L^{- 1}$

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Similar questions

Q. In a

50 m L

solution of

H_{2} O_{2}

an excess of

K I

and dilute

H_{2} S O_{4}

were added. The

I_{2}

liberated required

20 m L

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

for complete reaction.
Calculate the strength of

H_{2} O_{2}

in grams per litre.

Q. Excess of

K I

and

d i l . H_{2} S O_{4}

were mixed in

50 m L H_{2} O_{2}

. The liberated

I_{2}

required

20 m L

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

. Find out the strength of

H_{2} O_{2}

g p e r l i t r e

50 m L

of an aqueous solution of

H_{2} O_{2}

was treated with an excess of

K I

solution and dilute

H_{2} S O_{4}

. The liberated iodine required

20 m L 0.1 N N a_{2} S_{2} O_{3}

solution for complete interaction. Calculate the concentration of

H_{2} S O_{2}

g / L

50

ml of an aqueous solution of

H_{2} O_{2}

were treated with an excess of

K I

solution and dilute

H_{2} S O_{4}

. The liberated iodine required

20

mL of

0.1

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

solution for complete interaction. The concentration of

H_{2} O_{2}

in g/L is:

Q. Excess of

K I

and dil.

H_{2} S O_{4}

, were mixed in

50

H_{2} O_{2}

. The

I_{2}

liberated required

20

ml of

0.1

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

. Find out the strength of

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g / l i t^{- 1}

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Hydrogen Peroxide

Standard XII Chemistry

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In a 50 mL solution of H2O2 an excess of KI and dilute H2SO4 were added. The I2 liberated required 20 mL of 0.1N Na2S2O3 for complete reaction. Calculate the strength of H2O2 in grams per litre.

In a $50 m L$ solution of $H_{2} O_{2}$ an excess of $K I$ and dilute $H_{2} S O_{4}$ were added. The $I_{2}$ liberated required $20 m L$ of $0.1 N N a_{2} S_{2} O_{3}$ for complete reaction.
Calculate the strength of $H_{2} O_{2}$ in grams per litre.