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fuming HN03

kingjewel1
in Applied Chemistry

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how do i know when to incorporate the Kw constant into the calculation of the pH of an acid?

eg.

i have 1x10^-8 mol dm^-3 HNO3. a ridiculously small amount of acid in water... this means that the H30+ from the dissociation of the water actually is greater than this acid: 1x10^-7.

my question is how do i know not to incorporate it into an strong acid equation.

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