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a sample of p...

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a sample of pure calcium weighting 1.35 g was quantitatively converted to 1.86 g of pure CaO.atomic mass of calcium i

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Q. A sample of pure calcium weighing

1.35

g was quantitatively converted to

1.88

g of pure calcium oxide.

The atomic mass of calcium would be:

Q. Calcium and magnesium ion form a

10^{5}

L sample of hard water was quantitatively precipitated as carbonates and weight of precipitate obtained was found to be 568 g. On strong heating 264 g of weight is lost. The molarity of the

C a^{2 +}

ions in hard water is

x \times 10^{- 5}

10.0 g

sample of a mixture of calcium chloride and sodium chloride is treated with a

N a_{2} C O_{3}

solution. This calcium carbonate is heated to convert all the calcium to calcium oxide and the final mass of the calcium oxide is

1.62 g

. The percentage by mass of calcium chloride in the original mixture is:

Q. Calculate the percentage of carbon in a 55 % pure sample of calcium carbonate.

(C a = 40, C = 12, O = 16)

10.0 g

a sample of a mixture of calcium chloride and sodium chloride is treated with

N a_{2} C O_{3}

to precipitate the calcium as calcium carbonate. This

C a C O_{3}

is heated to convert all the calcium to

C a O

and the final mass of

C a O

1.62 g m s

%

C a C l_{2}

in the original mixture is :

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