vera_ewing
  • vera_ewing
A weak acid with an initial pH of 3.2 was titrated with a strong base. 15 mL of 0.1 M NaOH was added to the acid to reach the equivalence point at a pH of 8.6. What would you expect the approximate pH of the analyte to be after the first 5 mL of 0.1 M NaOH was added? A. 5.1 B. 7.2 C. 3.4 D. 8.6
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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taramgrant0543664
  • taramgrant0543664
Do you have a guess of which one it is?
taramgrant0543664
  • taramgrant0543664
I got 3.27
vera_ewing
  • vera_ewing
So maybe it's C?

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taramgrant0543664
  • taramgrant0543664
I'm thinking so I don't think I messed up on my math would you like to know what I did?
taramgrant0543664
  • taramgrant0543664
Ok so we have 15ml of 0.1M NaOH. We can find the moles of NaOH by multiplying the volume in liters (0.015L) by the molarity of 0.1
taramgrant0543664
  • taramgrant0543664
So that means I have 0.0015moles of NaOH
taramgrant0543664
  • taramgrant0543664
Then we can set up the ice table HA+NaOH ---> NaA+ H2O with the initial moles for NaOH as the 0.0015moles
taramgrant0543664
  • taramgrant0543664
I am really bad at explaining this I followed what they did in this link http://chemwiki.ucdavis.edu/Analytical_Chemistry/Quantitative_Analysis/Titration/Titration_Of_A_Weak_Acid_With_A_Strong_Base
vera_ewing
  • vera_ewing
Okay, hold on let me read it.
taramgrant0543664
  • taramgrant0543664
Let me try this again and I'll let you know
taramgrant0543664
  • taramgrant0543664
Now I'm getting an answer no where near anything my answer was just over one which does not make sense one bit!
aaronq
  • aaronq
I don't think you need to do any math for the question since all the possible options are so far apart. Picture a titration curve |dw:1437179500727:dw| Initially, and for most of the curve, the slope is small, so we don't expect use changes in pH. If you used 1/3 of the moles that got you to 8.6 (which is a difference of about 5 from 3.2). so, 1/3 of 5 is 1.7, so 3.2 + 1.7\(\approx\)5 so I think 5.1 is reasonable
aaronq
  • aaronq
sorry my graph is terrible and unrepresentative of whats going on lol
taramgrant0543664
  • taramgrant0543664
that makes sense just to clarify though the 1/3 you get from the fact that it's 5mL out of the 15mL?
aaronq
  • aaronq
yeah
taramgrant0543664
  • taramgrant0543664
Sounds good it makes a lot more sense than the number I got and not having to do all that math is even better lol
aaronq
  • aaronq
the math is often needed but it doesnt always have to be the first way to approach a problem.
vera_ewing
  • vera_ewing
It was 3.4
taramgrant0543664
  • taramgrant0543664
Good to know!

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