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100 parts of CaCO3 is equivalent to the __________ parts of sodium carbonate.

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100 parts of CaCO3 is equivalent to the __________ parts of sodium carbonate.

(a) 103

(b) 104

(c) 105

(d) 106

I have been asked this question in class test.

I need to ask this question from Problems, Units and Formulae topic in chapter Water of Applied Chemistry

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Right choice is (d) 106

Easiest explanation: 100 parts of CaCO3 is equivalent to the 106 parts of the sodium carbonate. So, the washing soda requirement is 100/106{temp Ca hardness+2.Mg hardness+perm(Mg+Fe+3Al)hardness+1/2 HCL+H2SO4-NaAlO2-CO2} .

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