When 4·2g of NaHCO₃ (sodium hydrogen carbonate) is added to a solution of CH3COOH (acetic acid) weighing 10·0g, it is observed that 2·2g of CO₂ is released into atmosphere. The residue is found to weigh 12·0g. Show that these observations are in agreement with the law of conservation of mass.

Solution

The reaction is
$stack NaHCO subscript 3 with Sodium space bicarbonate below plus space stack CH subscript 3 COOH with Acetic space acid below rightwards arrow space space stack CH subscript 3 COONa with Sodium space acetate below space plus straight H subscript 2 straight O plus CO subscript 2$
Total mass of the reactants
$equals thin space Mass space of space NaHCO subscript 3 space plus space Mass space of space CH subscript 3 COOH space equals space 4.2 plus 10.0 space equals space 14.2 space straight g Total space mass space of space products space equals space Mass space of space the space residue left parenthesis CH subscript 3 COONa plus straight H subscript 2 straight O right parenthesis space plus space Mass space of space the space CO subscript 2 space equals space 12 plus 2.2 space equals space 14.2 space straight g$
Thus, total mass of reactants (14.2) g
= Total mass of products (14.2) g
This illustrates the law of conservation of mass.

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Some Basic Concepts Of Chemistry

Some More Questions From Some Basic Concepts of Chemistry Chapter

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(iii) Energy
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NCERT Sample Papers

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Some Basic Concepts Of Chemistry

When 4·2g of NaHCO3 (sodium hydrogen carbonate) is added to a solution of CH3COOH (acetic acid) weighing 10·0g, it is observed that 2·2g of CO2 is released into atmosphere. The residue is found to weigh 12·0g. Show that these observations are in agreement with the law of conservation of mass.

Some More Questions From Some Basic Concepts of Chemistry Chapter

What is the number of significant figures in 0.0026?

What is the number of significant figures in 9.984?

Express the Avogadro's number (6·023×1023) upto three significant figures.

What is the result of (5.472 - 1.12) to the appropriate number of signficant figures?

Express 0.0468 in scientific notation.

What does SI units stand for?

What is the relation between temperature in Kelvin (K) and temperature on centigrade scale?

The popular unit of pressure is atmosphere, how is it related to pascal?

What are SI units of the following:(i) Density (ii) Molarity (iii) Energy (iv) Temperature ?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Express the Avogadro's number (6·023×10²³) upto three significant figures.

What are SI units of the following:

(i) Density
(ii) Molarity
(iii) Energy
(iv) Temperature ?