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Ways of Representing the Concentration of a Solution

28. A mixture...

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28. A mixture of NaI and NaCl when heated with excess of H2SO4 produced same weight of sodium sulphate as that of original mixture. Calculate the percentage of NaI in mixture.

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N a I (s) + K_{2} C r_{2} O_{7} (s) + c o n c . H_{2} S O_{4}

when heated in a test tube dark vapours evolve___.

Q. 10 g of a mixture of sodium chloride and anhydrous sodium sulphate is dissolved in water. An excess of barium chloride solution is added and 6.99 g. of barium sulphate is precipitated according to the equation :-

N a_{2} S O_{4} + B a C l_{2} ⟶ B a S O_{4} + 2 N a C l

.
The percentage of sodium sulphate in the original mixture is:

[N a = 23, O = 16, S = 32, B a = 132]

Q. The weight of mixture containing HCl and

H_{2} S O_{4}

0.1

g on treatment with an excess of an

A g N O_{3}

solution, reacted with this acid mixture gives

0.1435

g of AgCl, weight percentage of

H_{2} S O_{4}

4

g of a mixture of

N a H C O_{3}

N a C l

0.66

C O_{2}

gas is evolved. The percentage composition of the original mixture by mass is;

Q. A mixture of

H C O O H

H_{2} C_{2} O_{4}

is heated with conc.

H_{2} S O_{4}

. The gas produced is collected and on treating with

K O H

solution, the volume of gas decreases by

\frac{1}{6} t h

. Calculate the molar ratio of the two acids in original mixture.

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