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Preparation of 0.02 N CaCO3 Solution/Calcium carbonate preparation
take exactly 1 g CaCO3 . add some water. add 1:1 HCl to dissolve calcium carbonate.
keep it on hot plate for few minutes. remove and cool. add methyl red indicator. then add ammonia solution until it becomes orange colour. make up to 1000 ml. it's normality is 0.02N.
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