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Alicia Lin 2F
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Joined: Wed Sep 18, 2019 12:17 am


Postby Alicia Lin 2F » Mon Jan 20, 2020 3:06 pm

Is there a simpler way to solve this without using the quadratic equation? The problem gets messy when using quadratic.

Kallista McCarty 1C
Posts: 212
Joined: Wed Sep 18, 2019 12:18 am

Re: 5I.25

Postby Kallista McCarty 1C » Mon Jan 20, 2020 3:15 pm

If K is smaller than 10^-3 then you can use the approximation method Lavelle taught us in lecture!

Posts: 107
Joined: Sat Aug 17, 2019 12:16 am

Re: 5I.25

Postby lilymayek_1E » Mon Jan 20, 2020 3:16 pm

so I did this problem & checked the solutions manual, and really the only way it works well to get the final concentrations is to use the quadratic formula. Because every compound has an initial value (& will, as a result, have an "x" value of product added/removed), your K= P/R ratio should have two quadratics on both the top & bottom, but just remember that you can cross-multiply the R quadratic equation to the K value, then subtract the values of the P quadratic from the R quadratic & you will have zeroed out the equation.

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