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Analytical Chemistry involving buffer

  • Thread starter jkh4
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  • #1
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Homework Statement



What volume of 0.200M HCl must be added to 250.0ml of 0.300M sodium mandelate to produce a buffer solution with a pH of 3.37?


Homework Equations


The Attempt at a Solution



For 2 and 3, can I use the equation pH = pKa + log [A-/HA]? but for HCl isn't that 100% disassociation? How can we use that if the Ka is not a given value for HCl?

Thanks.
 

Answers and Replies

  • #2
chemisttree
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You are correct... Think of the HCl being used only to protonate a portion of the sodium mandelate.
 
  • #3
Borek
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And assume this protonation is stoichiometric.
 

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