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लेड सल्फेट का विलयेता-गुणनफल `3.4 xx 10^(-28)` है । लेड लवण के`1/(1000)` विलयन से को पूर्णतः अवक्षेपित करने के लिए आवश्यक सल्फाइड आयतन का सांद्रता ज्ञात करें । लवण को पूर्णतः विघटित मानें ।

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`[Pb^(2+)] = 0.001 M`
`[Pb^(2+)] xx [S^(2-) = 3.4 xx 10^(-20)`
या `0.001 xx [S^(2-)] = 3.4 xx 10^(-28)`
या `[S^(2-)] = (3.4 xx 10^(-28))/(0.001) = 3.4 xx 10^(-25) "mol" L^(-1)`

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