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Liquids in Liquids

1.4g of a sam...

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1.4g of a sample of chalk containing clay as impurity were treated with excess of did hcl . Volume of co2 evolved when measured at 15^°c 768mm pressure was 282 cm .calculate the percentage purity of sample.

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Q. A sample of chalk contains clay as impurity. The clay impurity loses

11 %

of its weight as moisture on prolong heating.

5

gram sample of chalk on heating shows a loss is weight (due to evolution of

C O_{2}

1.1 g

%

(C a C O_{3})

B a S O_{4}

was obtained as a dry precipitate when 10 g of an impure sample of

N a_{2} S O_{4}

was dissolved in water and treated with an excess of

B a C l_{2}

. Calculate the percentage purity of the

N a_{2} S O_{4}

sample. (Molar mass of

B a S O_{4} = 233 g a n d N a_{2} S O 4 = 142 g

)

11.65 g

B a S O_{4}

was obtained as a dry precipitate when

10 g

of an impure sample of

N a_{2} S O_{4}

was dissolved in water and treated with an excess of

B a C l_{2}

. Calculate the percentage purity of the

N a_{2} S O_{4}

sample. (Molar mass of

B a S O_{4} = 233 g a n d N a_{2} S O 4 = 142 g

)

3.0 g

of a sample of impure ammonium chloride were boiled with an excess of caustic soda solution. Ammonia gas so evolved was passed into

120 m L

N / 2 H_{2} S O_{4}

28 m L

N / 2 N a O H

were required to neutralize residual acid. Calculate the percentage of purity of the given sample of ammonium chloride.

1.249

g of a sample of pure

B a C O_{3}

C a C O_{3}

containing some

C a O

was treated with dilute

H C l

168

C O_{2}

at NTP. From this solution,

B a C r O_{4}

was precipitated, filtered and washed. The dried precipitate was dissolved in dilute sulphuric acid and diluted to

100

10

mL of this solution when treated with

K I

solution liberated iodine, which required exactly

20

0.05 N

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

. Calculate the percentage of

C a O

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