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when we calculate x for weak acid/base problems, we can disregard x in the denominator when Ka is less than 10^-3, because it doesn't add any significant change to the concentration of the reactants. does this same logic apply to the problems we solved for the chemical equilibrium section?
I think that you can ignore the x when you are adding it or subtracting it to some constant (e.g. 1.0-x) because the difference that x will make on the number is insignificant when x is that small. It is important to note that x does not equal zero though.
Conjugate acid is the molecule formed on the product side when a base reacts with water and gains hydrogen. Similarly, a conjugate base is the molecule formed when the acid loses hydrogen during a reaction. Thus, each reaction has a conjugate acid/base pair.
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