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`Na_2CO_3` तथा `CaCO_3` के एक मिश्रण के 1 .03 ग्राम को उदासीन करने के लिए `NHCI` के 20 मिली की आवश्यकता होती है| मिश्रण का प्रतिशत का संघटन ज्ञात करो|

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माना 1 .03 ग्राम मिश्रण में x ग्राम `Na_2CO_3` उपस्थित है तब `CaCO_3` की मात्रा `(1.03-x)` ग्राम होगी|
अतः `" " NaCO_3 ` के तुल्यांक `=(x)/(53) " "(E_(Na_2CO_3 )=53)`
तथा `" " CaCO_3` के तुल्यांक `=(1.03-x)/(50)" "(E_(Na_2CO_3)=50)`
अतः `" "` कुल तुल्यांक `=(x) /(53) +(1.03-x)/(50) `
HCI के मिली-तुल्यांक `=1xx20=20` मिली-तुल्यांक =`(1)/(50)` तुल्यांक
किन्तु मिश्रण के कुल तुल्यांक =HCI के तुल्यांक
` therefore " "(x) /(53)+(1.03-x)/(50) =(1)/(50) `
` " " x=0.50`
अतः `Na_2CO_3 ` की मात्रा =0 .50 ग्राम
` Na_2CO_3 ` का प्रतिशत `=(0.50)/(1.03)xx100=48.54%`
` CaCO_3 ` का प्रतिशत `=100-48.54=51.46%`

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