To find molecular mass of base (acidity = 4) by chloroplatinate salt method following graph is plotted. Molecular weight of base will be where $y =$ root of weight of platinum salt, $x =$ root of weight of residue.

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Acidity = 4 Graph: y = Pt s a lt ​ , x = res i d u e ​ , slope = 60° Sl o p e = x y ​ = tan 6 0 ∘ = 3 ​ → Molecular weight of base = 350

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