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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`.
`underset(underset(0.607g)("acid"))(H_(3)A)rarr underset(underset(0.37g)("salt"))(Ag_(3)A) rarr Ag`
Since Ag atoms are conserved, applying POAC for Ag atoms, moles of Ag atoms in Ag3A = moles of Ag atoms in the prduct
3 `times` moles of `Ag_(3)A` = moles of Ag in the product
`3 times 0.607/("mol. wt. of" Ag_(3)A)=0.37/108" (Ag = 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 times` at. wt. of Ag `+3 times ` at. wt. of H
= 531 - 324 + 3 = 210
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