Homework Problem 12.81

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lena1217
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Joined: Wed Sep 21, 2016 2:58 pm

Homework Problem 12.81

Postby lena1217 » Thu Dec 01, 2016 4:36 pm

For homework problem 12.81 why can you pretend like the Ka2 doesn't exist? The Solutions manual says it's because ka2<<ka1, but can someone help me understand why that means you can pretend like it doesn't happen and just solve for x with the data for ka1?

Chem_Mod
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Re: Homework Problem 12.81

Postby Chem_Mod » Fri Dec 02, 2016 11:52 am

When Ka2 is so much smaller than Ka1, the protons dissociated after the Ka2 reaction will not affect the concentration of the protons dissociated from the Ka1 reaction. So we can ignore it, which makes the calculation less laborious.


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