K < 10^-5, ok to neglect x even if equation is not cubic?

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K < 10^-5, ok to neglect x even if equation is not cubic?

Postby Chem_Mod » Sun Aug 21, 2011 12:40 pm

Question: If K is less than 10^-5, can we neglect x even if the equation to be solved is quadratic and not cubic?

Chem_Mod
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Re: k<10^-5, ok to neglect x even equation is not cubic?

Postby Chem_Mod » Sun Aug 21, 2011 12:42 pm

Answer: It depends on the expression K. If K = x^2/(1-x), x can be ignored in the (1-x) in order to simplify the calculation if K < 10^-5. In this case, we can neglect the x in 1-x and left with K = x^2.


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