Question

10)You make a buffer - 0.7M HF (Ka=7.2x10^-4) and 0.8M NaF in 1300 mls of solution....

10)You make a buffer - 0.7M HF (Ka=7.2x10^-4) and 0.8M NaF in 1300 mls of solution. whats the ph?

11) You add 50 mls of 3M NaOH to this buffer. find the ph

12) You add 80 mls of HCl to this buffer. find the ph
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Answer #1

10) The pH of the buffer can be calculated using the Henderson-Hasselbach equation:

We can do this directly remembering that pKa = -log(Ka):

11) The added NaOH reacts with HF to yield F-, so the concentrations after this addition are:

Se the pH is now:

12) When HCl is added, it reacts with F- to yield HF, but the calculations cannot be done because the concentration of HCl is not given. It is the exact same process as before. If you find difficulties solving it, use the comments section and I'll help you!

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