Chemistry question help (titration curve)

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chemhelpthanks
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Hi, I'm really stuck with this question. I don't get how you work out the concentration of an acid from a titration curve. I get that at

half equivalence point the pH = pKa. I did 10-pH at this point but got a weird number. Please help, thanks in advance.
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Last edited by chemhelpthanks; 4 weeks ago
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chemhelpthanks
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b

(Original post by chemhelpthanks)
Hi, I'm really stuck with this question. I don't get how you work out the concentration of an acid from a titration curve. I get that at

half equivalence point the pH = pKa. I did 10-pH at this point but got a weird number. Please help, thanks in advance.
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daan.m
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Well why don't you try looking at the equivalence point, rather than the half-equivalence point? I.e. look at the neutralisation rather than the buffer solution
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CaptainDuckie
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Look at how much glycolic acid is required for neutralisation.
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daan.m
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Also, there is no basic buffer solution because NaOH is a strong base
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chemhelpthanks
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(Original post by daan.m)
Well why don't you try looking at the equivalence point, rather than the half-equivalence point? I.e. look at the neutralisation rather than the buffer solution
would you work out the number of moles of base then rearrange and use the voume of acid at neutralisation point to work out concentration? for this i got 0.125 but its the wrong answer
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CaptainDuckie
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(Original post by chemhelpthanks)
would you work out the number of moles of base then rearrange and use the voume of acid at neutralisation point to work out concentration? for this i got 0.125 but its the wrong answer

Did they give you an equation for any of the previous parts?
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chemhelpthanks
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(Original post by CaptainDuckie)
Did they give you an equation for any of the previous parts?
No they didn't
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chemhelpthanks
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(Original post by chemhelpthanks)
No they didn't
Oh wait sorry, 0.125 is the right answer my apologies
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CaptainDuckie
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(Original post by chemhelpthanks)
Oh wait sorry, 0.125 is the right answer my apologies

Check properly next time, otherwise you just waste time.
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