Question

How do I calculate the amount of grams of Na2HPO4 and NaH2PO4 to prepare 200 mL of a buffer with an 8.25 pH so the sum of the concentrations of HPO4 and H2PO4 ions is 0.5 M? Does this involve writing a Ka expression and equilibrium? I am confused and Thanks for your help!

Mar 11, 2012

Sorry I don't know how it posted twice! Oops! :-)

Mar 11, 2012

See your other post. The HH equation is the secret weapon.

Mar 11, 2012

Related Questions

Calculate the amount of NaH2PO4 and Na2HPO4 needed to prepare 100 mL of a buffer with a pH = 8.25 so... Write up the recipe to make 100mL of a 200mM phosphate buffer, pH 7.0 by using: (a) only NaH2PO4... To prepare 500.00 mL of 0.300 M buffer with a pH of 7.4. NaH2PO4/Na2HPO4 How many grams of each shou...