Pt + 3:1 mixture of (conc. HCl + conc. HNO_3) | vedclass

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Question

(C) When $Pt$ reacts with a $3:1$ mixture of concentrated hydrochloric acid $(HCl)$ and concentrated nitric acid $(HNO_3)$, it forms a solution known

Vedclass · Accepted Answer

$4$

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(C) When $Pt$ reacts with a $3:1$ mixture of concentrated hydrochloric acid $(HCl)$ and concentrated nitric acid $(HNO_3)$, it forms a solution known as aqua regia. Aqua regia is capable of dissolving platinum by forming chlorocomplexes. The reaction typically forms $H_2[PtCl_6]$.In this complex, the $Pt$ is in the $+4$ oxidation state. The balanced chemical equation for the reaction is:$Pt + 4HNO_3 + 6HCl \rightarrow H_2[PtCl_6] + 4NO_2 + 4H_2O$So, in $[PtCl_6]^{2-}$ the oxidation state of $Pt$ is:$x + 6(-1) = -2$$x - 6 = -2$$x = +4$

$Pt + 3:1$ mixture of (conc. $HCl +$ conc. $HNO_3$) $\rightarrow [X]^{2-}$. What is the oxidation state of $Pt$ in $[X]^{2-}$ complex ion?

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