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Biology and Chemistry Homework Help
Calculating pKa from pH: Understanding Titration
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[QUOTE="epenguin, post: 5976211, member: 106258"] Can I ask what country you are studying in? This question has certain geographical hallmarks.I would probably fail the exam there because I would write as answer " good luck with finding the pH at the equivalence point!".I would know where the equivalence point is alright but the pH there is varying wildly. Anyway you have worked out the molarity of the NaA solution, now suppose we dissolved NaA In water to make that molarity, to ask what the pH of that solution would be, knowing that pK[SUB]a[/SUB], would make sense. So would the inverse question, knowing the pH what is the pK[SUB]a[/SUB]? It is too late at night for me to concentrate on your calculation, but there might be a mistake where you say the moles of OH[SUP][SUP]-[/SUP][/SUP], are the moles of A?? - rather they are the moles of moles of HA aren't they? I suggest you write out the formula for K[SUB]a[/SUB] explicitly and then play with that – you should get a formula with a square in it that you may remember. [/QUOTE]
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Calculating pKa from pH: Understanding Titration
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