approximation
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Re: approximation
I believe we approximate because the value is so small that it is insignificant when calculating the amount.
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Re: approximation
When you have a very small value of x it is essentially negligible when compared to the initial concentration, so we can approximate to make the calculations much simpler as compared to using a quadratic equation.
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Re: approximation
Also, if you are not sure if you are able to approximate for the acid and base problem. You can employ the 5% rule which is look at the amount protonated/ionized. If the precent is over 5% you shouldn't have approximated for x.
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Re: approximation
X is approximated because weak acids do not 100% dissociate in solution. Because of this, we can assume that the value of change is so small that it is negligible.
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