Thursday, December 16, 2010

PREPARING LIME WATER.

                    Dissolve some calcium hydroxide (lime used in betel chewing) in water. When you filter this solution with a filter paper you get lime water. It is a colourless solution.  A white layer could be seen if the lime water solution is exposed to air.

SENT CARBON DIOXIDE INTO LIME WATER.

            When carbon dioxide gas is sent to lime water, calcium hydroxide in lime water reacts with the gas giving white calcium carbonate which is insoluble. The solution becomes milky due to this. If we pass carbon dioxide continuously, calcium bicarbonate which is soluble is formed. The the solution become clear again.

PROPERTIES OF CARBON DIOXIDE

CARBON DIOXIDE GAS IS,
1.IS colour less,
2.Has specific odour,
3.Is heavier than air,
4.Is a non – supporter of combustion,
5.Turns lime water milky,
6.Have fire exitinguishing properties.

CARBON DIOXIDE IS A NON SUPPORTER OF COMBUSTION

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