Gold will not dissolve in either concentrated nitric acid or concentrated hydrochloric acid. However, the metal does

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Gold will not dissolve in either concentrated nitric acid or concentrated hydrochloric acid. However, the metal does dissolve in a mixture of the acids (one part HNO3 and three parts HCl by volume), called aqua regia.
(a) Write a balanced equation for this reaction. (Among the products are HAuCl4 and NO2.) (b) What is the function of HCl?
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Chemistry

ISBN: 978-0077274313

10th edition

Authors: Raymond Chang

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