Take freshly prepared lime water in a test tube. blow for some times into the lime water through the straw and observe the lime water. 1) what did you see?2) what might be the reason behind the changes?3) write the chemical reaction for the above statement?4) write down the uses of the important gas which is used in the experiment.5) write down the chemical reactions of Na2CO3 with H2SO4.
Answers
1) The lime water turns milky.
2) Exhaled carbon dioxide which is blown in the lime water turns it milky
3) Ca(OH)2 + CO2 -> CaCO3 + H2O
4) carbon dioxide is used by plants for photosynthesis and they provide us with food.
Freshly prepared lime water in a test tube is blown with a straw following are observed:
1) The lime water present in the test tube turns milky in colour.
2) Lime water is turned milky due the blowing of carbon dioxide into it as carbon dioxide turns lime water milky.
3) Ca(OH)2+ CO2 -> CaCO3 Lime water calcium
carbonate
+ H2O
4) Carbon dioxide plays an important role in photosynthesis and which is necessary for preparation of food by plants.
4. Na2CO3 + H2SO4 gives Na2So4 + CO2 + H2O.
Sodium carbonate when reacts with sulphuric acid it gives sodium sulphate + carbon dioxide + water.