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Equivalent Mass

3 gm of CuS...

Question

3 gm of ${C u S O}_{4}$ , $5 H_{2} O$ sample containing inert impurity reacted with KI and the liberated $I_{2}$ reacted with $10 m l$ of $0.5 M$ ${N a}_{2} S_{2} O_{3}$ . The % purity of $C u S O_{4} .5 H_{2} O$ will be:

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Solution

$2 C u S O_{4} + 2 K I ⟶ C u_{2} S O_{4} + K_{2} S O_{4} + I_{2}$

$I_{2} + 2 N a_{2} S_{2} O_{3} ⟶ N a_{2} S_{4} O_{6} + 2 N a I$

$10 m l$ of $0.5 M N a_{2} S_{2} O_{3} = \frac{0.5}{100}$ mole= $0.005$ mole of $N a_{2} S_{2} O_{3}$

$∴$ The number of moles of $I_{2}$ liberated= $\frac{0.005}{2} = 0.0025$ moles

$∴ 0.0025$ moles of $I_{2}$ was liberated from $0.0025 \times 2 = 0.005$ moles of $C u S O_{4}$ i.e. $C u S O_{4} .5 H_{2} O$

Now, $0.005$ moles of $C u S O_{4} .5 H_{2} O = 0.005 \times 249.677 = 1.248 g m$

$∴$ The percentage of purity= $\frac{1.248}{3} \times 100 = 41.6$ %

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Similar questions

40 g B a (M n O_{4})_{2}

= 375

g/mol) sample containing some inert impurities in acidic medium is completely reacted with

125

33.6 V

H_{2} O_{2}

. What is the percentage purity of the sample?

(a)

C u S O_{4}

K I

in acidic medium to liberate

I_{2}

.

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

(b)

Mercuric perisdate,

H g_{5} (I O_{6})_{2}

reacts with a mixture of

K I

H C l

according to the following the equation:

H g_{5} (I O_{6})_{2} + 34 K I + 24 H C l ⟶ 5 K_{2} H g I_{4} + 8 I_{2} + 24 K C l + 12 H_{2} O

(c)

The liberated iodine is titrated against

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

solution, one mL of which is equivalent to

0.0499

C u S O_{4} .5 H_{2} O

What volume in mL of

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

solution will be required to react with

I_{2}

0.7245

H g_{5} (I O_{6})_{2}

? (Molar mass of

C u S O_{4} .5 H_{2} O = 249.5

H g_{5} (I O_{6})_{2} = 1448.5

K I

C u S O_{4}

{N a}_{2} S_{2} O_{3}

solution is added to it. Which of the following statements is incorrect for the reaction?

40

{B a ({M n O}_{4})}_{2}

(molecular weight

= 375

g/mol) sample containing some inert impurities in acidic medium is completely reacted with

125

33.6 V

H_{2} O_{2}

. What is the percentage purity of the sample?

638.0

C u S O_{4}

solution is titrated with excess of

0.2 M

K I

solution. The liberated

I_{2}

400

1.0 M

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

for complete reaction. The percentage purity of

C u S O_{4}

in the sample is:

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Equivalent Mass

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