Hey Please help me with my last project of Chemistry. I have to give this project in next 30 minute. The project is that we have to show that when Carbon dioxide is passed through lime water it turns milky and describe it with the equation. We have to briefly explain. Class 7.
Answers
Resultant carbon dioxide passed through limewater in the right tube, producing a milky solution due to precipitation of the insoluble suspension of calcium carbonate:
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
If excess CO2 is added: the following reaction takes place:
CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq)
The milkiness disappears since calcium bicarbonate is water-soluble.
This liquid has been known traditionally as milk of lime.
It is basic in nature with a pH of 12.4.
"Pure" (i.e. less than or fully saturated) limewater is clear and colorless, with a slight earthy smell and an astringent/bitter taste.
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Answer:
- Take a teaspoon of vinegar in a test tube and add a pinch of baking soda.
CH3COOH(vinegar containing acetic acid)+ NaHCO3(baking soda containing sodium bicarbonate) ---> H2O (water) + CO2(Carbon dioxide) + CH3COONa(sodium acetate)
Hear the hissing sound coming out of it. Pass the gas through lime water. Lime water has calcium hydroxide.
CO2 + Ca(OH)2 ---> CaCO3 + H2O
The lime water turns milky because calcium carbonate is milky white. And also some water is evolved.
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