Advertisements
Advertisements
Question
Copper sulphate reacts with sodium hydroxide to form a blue precipitate of copper hydroxide and sodium
sulphate. In an experiment, 15.95 g of copper sulphate reacted with 8.0 g of sodium hydroxide to form
9.75 g of copper hydroxide and 14.2 g of sodium sulphate. Which law of chemical combination is illustrated by this data ? Give reason for your choice.
Advertisements
Solution
Chemical reaction:
CuSO4 + NaOH → Cu(OH)2 + NaSO4
15.94g 8.0g 9.75g 14.2g
Total mass of reactants = Total mass of products
23.95g 23.95 g
The above reaction and data illustrate the law of conservation of mass which was proposed by Antoine Lavoisier.
The law states that the mass of elements remains constant over time i.e. mass can neither be created nor destroyed. In the above reaction, the mass of reactants (23.95 g) is exactly equal to the mass of their product (23.95 g). There is no change in the mass of the product after the reaction.
APPEARS IN
RELATED QUESTIONS
Give reason for the following.
Electricity is not considered matter.
Fill in the blank:
Matter is anything that has............. and occupies .............
Name the law of chemical combination which was given by Lavoisier.
Name the law of chemical combination which was given by Proust.
State the law of conservation of mass. Give one example to illustrate this law.
Which postulate of Dalton's atomic theory can explain the law of conservation of mass ?
The law of conservation of mass was given by :
An ionic compound will be formed by the combination of one of the following pairs of elements. This pair of elements is :
State the main points of Landolt’s experiment for experimental evidence of the law.
Why does a light paddle wheel placed in the path of cathode rays begin to rotate, when cathode rays fall on it?
