Calculate the solubility (common ion) buffered

  • Chemistry
  • Thread starter il postino
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  • #1
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Homework Statement:
Calculate the solubility of CaC2O4 in a 0.001M solution of Na2C2O4 buffered to pH equal to 4
Relevant Equations:
Kps=(Ca+2).(C2O4-2)
Data:
##
pK_{ps} , pKa_{1} , pKa_{2}
##

Could you guide me to start solving?
Thank you!
 

Answers and Replies

  • #2
Borek
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Hint: only concentration of (COO-)2 counts.
 
  • #3
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58
First, set up and ICE table for the chemical equation of ##\mathrm{CaC_2O_4}## and think about what the initial concentration of the relevant dissociated ion is.
 
  • #4
Borek
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3,190
set up and ICE table for the chemical equation of ##\mathrm{CaC_2O_4}##

Taking into account I is zero I don't think that will help much.
 
  • #5
epenguin
Homework Helper
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3,863
895
Hint: only concentration of (COO-)2 counts.
Which is in your Relevant Equation. So can start. Wonder what's taking?
 
  • #6
160
58
Taking into account I is zero I don't think that will help much.
Taking into account I is zero I don't think that will help much.
Yes. My mistake. My brain completely skipped over important parts of the question.
 

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