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Byju's Answer

Standard VIII

Chemistry

Characteristics of Chemical Reaction

25 mL of a so...

Question

$25$ mL of a solution containing $H C l$ was treated with excess of $K I O_{3}$ and $K I$ solution of unknown concentration, where $I_{2}$ liberated is titrated against a standard solution of $0.021 M$ $N a_{2} S_{2} O_{3}$ solution, whose $24$ mL were used up. The strength of $H C l$ is :

0.0165

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0.0201

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0.0868

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none of the above

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Solution

The correct option is B $0.0201$
$I_{2} + 2 N a_{2} S_{2} O_{3} \to 2 N a I + N a_{2} S_{4} O_{6}$

$K I O_{3} + 5 K I + 6 H C l \to 6 K C l + 3 H_{2} O + 3 I_{2}$
$6$ mole $H C l = 3$ mole $I_{2} = 6 mole N a_{2} S_{2} O_{3}$
$1$ mole $H C l = 1 mole N a_{2} S_{2} O_{3}$
$25 \times M = 24 \times 0.021$
$M = 0.020 M$
Hence, the strength of $H C l$ is $0.020$ M.

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25 mL of a solution containing HCl was treated with excess of KIO3 and KI solution of unknown concentration, where I2 liberated is titrated against a standard solution of 0.021 M Na2S2O3 solution, whose 24 mL were used up. The strength of HCl is :

The correct option is B 0.0201I2+2Na2S2O3→2NaI+Na2S4O6KIO3+5KI+6HCl→6KCl+3H2O+3I26 mole HCl=3 mole I2=6 mole Na2S2O31 mole HCl=1 mole Na2S2O325×M=24×0.021 M=0.020MHence, the strength of HCl is 0.020 M.

$25$ mL of a solution containing $H C l$ was treated with excess of $K I O_{3}$ and $K I$ solution of unknown concentration, where $I_{2}$ liberated is titrated against a standard solution of $0.021 M$ $N a_{2} S_{2} O_{3}$ solution, whose $24$ mL were used up. The strength of $H C l$ is :