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The reaction of Sodium sulphate with barium chloride
Everything around us is made up of matter. Matter is defined as anything that has mass
and takes up space. The changes in matter can be divided into two categories: Physical
and chemical change.
Physical changes occur when substances or objects undergo a change without changing
into another substance. Changes in state or phase like melting, freezing, vaporization,
condensation, sublimation are physical changes. Examples of physical changes include crushing
a can, melting an ice cube, and breaking a bottle. Chemical changes are changes that
substances undergo when they become new or different substances. Examples of chemical
changes include burning wood, cooking an egg, rusting of an iron pan, and mixing acid and
base etc.
The aim of the experiment is to carry out the reaction between sodium sulphate and barium
chloride in as solutions in water, and classify the change as physical or chemical.
Materials required:
Solution of barium chloride Solution of sodium sulphate
Boiling tubes. Procedure:
Take a small quantity of, sodium sulphate solution in one boiling tube and barium chloride
solution in another boiling tube. Pour the barium chloride solution into the
boiling tube containing sodium sulphate solution. A white precipitate of barium sulphate is
formed in the boiling tube. Now keep the content of the boiling tube undisturbed
for 10 minutes. After 10 minutes, we can see that the white
precipitate in the test tube settles down. This confirms the presence of sulphate ions
in the solution. Now decant the upper solution from the boiling
tube to a beaker. Add a few drops of dilute HCL to the white
precipitate of barium sulphate and shake the test tube well.
We can observe that white precipitate remains insoluble with the dilute HCL .
This reaction indicates a chemical change as the products are entirely different from
the reactants in chemical composition and chemical properties.
Precautions:
Handle the acids and alkalies carefully. Keep the mouth of the test tube away from
your and others face.