7th edition 6K.1

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Alyssa Bryan 3F
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7th edition 6K.1

Postby Alyssa Bryan 3F » Sun Feb 24, 2019 11:54 am

The following redox reaction is used in acidic solution in the Breathalyzer test to determine the level of alcohol in blood: H+ + Cr2O7^2- + C2H5OH = Cr^3+ + C2H4O + H2O.
When writing the balanced oxidation half-reaction, why can you add 2 H+ to the reaction to get C2H5OH = C2H4O + 2H+ + 2e- when there are no H+ on the right side of the equation?

Kevin Tang 4L
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Re: 7th edition 6K.1

Postby Kevin Tang 4L » Sun Feb 24, 2019 12:54 pm

It is because it is an acidic solution. If it is a basic solution, you have to use OH-.

Hope this helps and correct me if I'm wrong.

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Re: 7th edition 6K.1

Postby ariana_apopei1K » Sun Feb 24, 2019 9:31 pm

think of adding H+ the same as balancing the equation. the left side has 6 H's and the right only has 4, so you add 2 H's to even it out

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