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Yiwei Zhou 2I
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Joined: Fri Sep 29, 2017 7:07 am


Postby Yiwei Zhou 2I » Fri Mar 16, 2018 4:22 pm

14.119 One stage in the extraction of gold from rocks involves dissolving the metal from the rock with a basic solution of sodium cyanide that has been thoroughly aerated. This stage results in the formation of soluble Au(CN)2- ions. The next stage is to reduce gold to the metal by the addition of zinc dust,
forming Zn(CN)4^2-. Write the balanced equations for the half reactions and the overall redox equation for both stages.

The half reactions do not address Na+, CN-, and Au(CN)2-. Why these chemicals are included in the net ionic equation in the solution manual?

Thanks a lot if someone could answer my question.

Michaela Capps 1l
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am

Re: 14.119

Postby Michaela Capps 1l » Fri Mar 16, 2018 9:07 pm

The half reactions only include the elements that are being oxidized or reduced. The net ionic equation will include all elements (and spectator ions) to balance the two sides.

Posts: 32
Joined: Fri Sep 28, 2018 12:20 am

Re: 14.119

Postby Philipp_V_Dis1K » Wed Feb 27, 2019 4:34 pm

redox reactions are net ionic, meaning the ions that do not change charge in the reaction are left out

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