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29/12/2020 11:52 am
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Take one of the following sets X and Y of chemicals
X – Y
(i) Copper sulphate – Sodium carbonate
(ii) Barium chloride – Sodium sulphate
(iii) Lead nitrate – Sodium chloride
- Prepare separately 95% solution of any one pair of substances listed under X and Y in water.
- Take little amount of solution of Y in a conical flask and some solution of X in an ignition tube.
- Hang the ignition tube in the flask carefully; see that the solutions do not get mixed.
- Put a cork on the flask as shown in figure.
- Weigh the flask with its contents carefully.
- Now tilt and swirl the flask, so that the solutions X and Y get mixed.
- Weigh again.
- What happens in the reaction flask?
- Do you think that a chemical reaction has taken place?
- Why should we put a cork on the mouth of the flask?
- Does the mass of the flask and its contents change?
1 Answer
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29/12/2020 11:53 am
- In the reaction flask both the reactants combined to give new products.
- Yes.
- We should put a cork on the mouth of the flask so that no other gases in the air combine or get added into the reaction, neither any gas formed in the reaction should escape.
- No. The mass of the flask before and after reaction do not change.