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Standard XII

Chemistry

Nucleophilic Substitution Reaction

A sample of C...

Question

A sample of CaCO3 is 50% pure . On heating 1.12L of CO2 (at STP) is obtained . Residue left (assuming non-volatile impurity) is

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Solution

$C a C O_{3} \leftrightarrow C a O + C O_{2} 100 g o f C a C O_{3} g i v e s 1 m o l e o f c a r b o n d i o x i d e = 22.4 L T h a t i s 22.4 L o f C O_{2} i s o b t a i n e d f r o m 100 g o f C a C O_{3} S o 1.12 L o f C O_{2} i s o b t a i n e d f r o m = \frac{100}{22.4} \times 1.12 = 5 g o f C a C O_{3} I f t h e s a m p l e i s 100 % p u r i t y t h e a m o u n t o f C a C O_{3} = 5 g F o r 50 % s a m p l e t h e a m o u n t o f C a C O_{3} = \frac{5}{100} \times 50 = 2.5 g T h e a m o u n t o f r e s i d u e l e f t i s c a l c u l a t e d a s f o l l o w s 100 g o f C a C O_{3} g i v e s 56 g o f C a O a s n o n v o l a t i l e i m p u r i t y 2.5 g o f C a C O_{3} g i v e s = \frac{56}{100} \times 2.5 = 1.4 g o f C a O T h u s t h e r e s i d u e l e f t = 1.4 g o f C a O$

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Similar questions

Q. A sample of

C a C O_{3}

50 %

pure. On heating

1.12 L

C O_{2}

(at STP) is obtained. Residue left (assuming non-volatile impurity) is:

Q. Calculate the mass of residue obtained when

C a C O_{3}

is strongly heated and

5.6 L C O_{2}

is produced at STP.

6.2

g of a sample containing

N a_{2} C O_{3}, N a H C O_{3}

and non-volatile inert impurity on gentle heating loses

5 %

of its weight due to reaction:

2 N a H C O_{3} \to N a_{2} C O_{3} + H_{2} O + C O_{2}

. Residue is dissolved in water and formed

100 m L

solution and its

10 m L

portion requires

7.5 m L

0.2 M

aqueous solution of

B a C l_{2}

for complete precipitation of carbonates. Determine weight (in g) of

N a_{2} C O_{3}

in the original sample.

6.2

g of a sample containing

N a_{2} C O_{3}, N a H C O_{3}

amd non-volatile inert impurity on heating loses

5 %

of its weight due to formation of

H_{2} O

and

C O_{2}

as in reaction:

2 N a H C O_{3} \to N a_{2} C O_{3} + H_{2} O + C O_{2}

Residue is dissolved in water and formed

100

ml solution and its

10

ml portion requires

4.5

ml of

0.2 M

aqueous solution of

B a C l_{2}

for complete precipitation of carbonates. If number of moles of

N a_{2} C O_{3}

in the original sample were

q

, then the value of

100 q

is:

6.2

g of a sample containing

N a_{2} C O_{3}

N a H C O_{3}

, and non volatile inert impurity on gentle heating losses

5

percent of its weight. Residue is dissolved in water and

100

mL solution is formed. Its

10

mL portion requires

7.5

mL of

0.2

M aquous solution of

B a C l_{2}

for complete precipitation. Determine weight (in gram) of

N a_{2} C O_{3}

in the original sample.

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