Asked by Reven

Determine the pH (to two decimal places) of a solution prepared by adding 15.9 mL of 0.0551 M sodium hydrogen oxalate (NaHOOCCOO) to 0.488 g of sodium oxalate (Na2OOCCOO).
Hydrogen Oxalate pKb of 12.77
Oxalate pKb of 9.81

Answers

Answered by DrBob222
mmoles acid = 15.9 x 0.0551 = ?
mmoles base = 0.488/molar mass Na2C2O4)

pH = pKa2 + log(base)/(acid)
You must convert pKb above (you want the HC2O4^- to pKa by pKa + pKb = pKw = 14.
Also, I have not taken the volume into account and used ONLY millimoles. Since that is a ratio, mmoles/mmoles cancels out the units AND since concn is mmoles/mL and the mL is the same for acid and base, the volume (whatever it may be) always cancels, too.
There are no AI answers yet. The ability to request AI answers is coming soon!

Related Questions