p-Block Elements – II — Chemistry STD 12 — Question
Tamilnadu BoardEnglish MediumSTD 12Chemistryp-Block Elements – II3 Marks
Question
What is Royal water?
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Answer
When three parts of concentrated hydrochloric acid and one part of concentrated nitric acid are mixed, aquaregia is obtained. This is also known as Royal water. This is used for dissolving gold, platinum etc.
$Au +4 H ^{+}+4 NO _3^{-}+4 Cl ^{-} \rightarrow AuCl _4^{-}+ NO +2 H _2 O $
$3 Pt +16 H ^{+}+4 NO _3^{-}+18 Cl ^{-} \rightarrow 3 PtCl _3^{2-}+ NO +8 H _2 O$
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