Textbook question 5I.3

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Paige Lee 1A
Posts: 136
Joined: Sat Sep 07, 2019 12:16 am

Textbook question 5I.3

Postby Paige Lee 1A » Wed Jan 08, 2020 2:09 pm

Could someone please explain how to get the correct answer?
I keep getting 4.21*10^-6 mols/L

Maya Pakulski 1D
Posts: 105
Joined: Thu Jul 11, 2019 12:17 am

Re: Textbook question 5I.3

Postby Maya Pakulski 1D » Wed Jan 08, 2020 2:23 pm

I need this as well. I keep getting a different answer too.

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

Re: Textbook question 5I.3

Postby Ryan Chang 1C » Wed Jan 08, 2020 5:37 pm

The K value for this reaction is 160. Since HI (2.21x10^-3 M) is the product and H2 (unknown) and I2 (1.46x10^-3 M) are the reactants, the expression will look like this:

160 = (2.21x10^-3)^2 / (H2)(1.46x10^-3)

Solving for H2 gives you 2.1x10^-5 M.


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