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anonymous
 one year ago
A buffer solution is prepared by mixing 15.0 mL of 2.00 M Acetic Acid and 10.0 mL of 1.50 M NaC2H3O2. Determine the pH of the solution after the addition of 0.015 moles HCl (assume there is no change in volume when the HCl is added).
Ka HC2H3O2 = 1.80E5
anonymous
 one year ago
A buffer solution is prepared by mixing 15.0 mL of 2.00 M Acetic Acid and 10.0 mL of 1.50 M NaC2H3O2. Determine the pH of the solution after the addition of 0.015 moles HCl (assume there is no change in volume when the HCl is added). Ka HC2H3O2 = 1.80E5

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aaronq
 one year ago
Best ResponseYou've already chosen the best response.0Use the HendersonHasselbalch equation

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@aaronq I used heendersonHasselbalch equation and I got 4.745 for my Pka and for the pH I got 5.0298 but it is saying that my answer is incorrect by more than 10%

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0What you did write for the \(log\dfrac{[A^]}{[HA]}\) part

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0pH= 4.744727495 + log [0.615]/ [1.185] = 5.029843235

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0so, the 0.015 moles of HCl neutralizes the 15 mL of 1.5 M of sodium acetate. so in fact you have 0.03 moles (from 15.0 mL of 2.0 M acetic acid) + 0.15 moles 0.045 moles total, so use an equilibrium expression to find \([H^+]\)

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0\(\sf K_A=\dfrac{[H^+][acetate^]}{[acetic~acid]}=\dfrac{x^2}{(0.045x)}\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@aaronq Hey, so when i worked it out I got 3.049903011 for the pH and its saying that I am still incorrect by 10%. This is so confusing :(

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0that's really weird man, i dont know what could be wrong

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@aaronq me either, thank you so much though for your assistance!

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0do you think it could be 4.04? because 5.4 is 10% away, and 3.04 is also 10%, so the value should be directly between them
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