finding conc. from Kc

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claire ikemiya_2I
Posts: 74
Joined: Wed Sep 30, 2020 9:50 pm

finding conc. from Kc

Postby claire ikemiya_2I » Mon Jan 18, 2021 12:09 pm

So this is a problem from UA Matthew Tran's week 1 worksheet. The number in red is the answer and I can't figure out what is wrong with my work. Any sugguestions?
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Joseph Hsing 2C
Posts: 91
Joined: Wed Sep 30, 2020 9:42 pm

Re: finding conc. from Kc

Postby Joseph Hsing 2C » Mon Jan 18, 2021 12:17 pm

Only thing you missed was to balance the equation, put a 3 in front of HClO. Your final answer would then be missing a cube root.

Irene Chang 2F
Posts: 40
Joined: Wed Nov 18, 2020 12:30 am
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Re: finding conc. from Kc

Postby Irene Chang 2F » Mon Jan 18, 2021 5:05 pm

Always remember to check if the equation is balanced first! Your equation should be NCl3 + 3H2O <--> NH3 + 3HClO. Then the Kc constant would be: ([NH3]([HClO]^3))/([NCl]([H2O]^3)).

Bella Bursulaya 3G
Posts: 139
Joined: Wed Sep 30, 2020 9:54 pm

Re: finding conc. from Kc

Postby Bella Bursulaya 3G » Mon Jan 18, 2021 5:25 pm

Happened to me as well. Make sure at the beginning of any problem to check if the equation is balanced or not. Even if there are already numbers in front of the molecules, this may be a trick so always double check!


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