Preparation of Buffer Solution

kiankheong yewpang at tm.net.my
Mon Jul 6 04:10:42 EST 1998


Please help me on this.

1) The pKa value of H3PO4 are pKa1=2.1, pKa2=7.2, and pKa3=12.7. How can I
prepare a phosphate buffer solution of pH6.7 starting with 0.1M H3PO4 and
0.1M NaOH?
2) What is the pH and concentration of a phosphate buffer solution when
3.48g K2HPO4 and 2.72g KH2PO4 are solute with 250ml of water without
ionization?
3) An acetate buffer contains 0.1M CH3COOH and 0.1M CH3COOH- . What is the
pH after 4ml 0.025M HCl is added to 10ml of this buffer solution?

I would greatly appreciate your kindness if you could help me to answer
these questions. I hope to receive a speedy reply. E-mail: yewpang at tm.net.my

Thank you






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