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0.607g of silver salt of tribasic organi...

`0.607g` of silver salt of tribasic organic acid was quantitatively reduced to `0.37g` of pure `Ag`. What is the mol. Wt. of the acid ?

Text Solution

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Suppose the tribasic acid is `H _(3) A.`
`{:(H_(2) Ato, Ag _(3) A, to Ag ), ("acid",, "salt"), (,0.607 g, 0.37g):}`
Since Ag atoms are conserved, applying POAC for Ag atoms , moles of Ag atoms in `Ag _(3)A= ` moles of Ag atoms in the product
`3 xx ` moles of `Ag _(3) A = ` moles of Ag in the product
`3xx (0.607)/("mol. wt. of" A g _(3) A) = ( 0.37)/(108)`
mol. wt. of `Ag _(3) A = 531.`
`therefore` mol, weight of tribasic acid `(H (3) A)`
= mol wt. of the salt `(Ag _(3) A) - 3 xx at.` wt. of Ag + `3 xx at. ` wt of H
`= 531 - 324 + 3 = 210.`
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