September 26, 2021, 09:27:42 PM
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Topic: Have I balanced this reaction correctly?  (Read 340 times)

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Offline Wienerbroed

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Have I balanced this reaction correctly?
« on: June 26, 2021, 12:24:57 PM »
I need to write the balanced reaction between aqua regia (HNO3 + 3HCl) with gold (Au), with the gold oxidizing to 3+ ions.

Based on what I've read online the reaction should go like:

4HNO3 + 12HCl + 3Au ---> 4NO + 8H2O + 3AuCl4-

If this is true, how come 3AuCl4- is formed instead of 3AuCl3, considering Au has oxidation number 3+ in this case?
« Last Edit: June 26, 2021, 12:35:57 PM by Wienerbroed »

Offline sjb

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Re: Have I balanced this reaction correctly?
« Reply #1 on: June 26, 2021, 01:12:11 PM »
Your equation is not balanced - check the charges.

Perhaps have a look at https://en.wikipedia.org/wiki/Aqua_regia#Dissolving_gold or similar?

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