August 1, 2015

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Posted by alshammari on Sunday, December 11, 2011 at 7:58am.

What is the pH of 0.1 M formic acid solution? Ka=1.7e10-4?
What is the pH value of buffer prepared by adding 60 ml of 0.1 M CH3COOH to 40 ml of a solution of 0.1 M CH3COONa? What is the pH value of an acetate buffer (pK=4.76) prepared by adding 20 ml of 1 M HCl to 100 ml of a solution of 0.3 M sodium acetate? What is the pH value of a buffer made up of 10 ml of 0.1 M NaHCO3 and 5 ml of 0.14 M H2CO3? The pKa for bicarbonate is 6.1. How would you make 1 l of a 0.1 M acetic acid buffer with a pH=4.9? The MW of acetic acid is 60 g/mole, the MW of sodium acetate is 82 g/mole. The acetate buffer is made by mixing 250 ml of 0.5 M acetic acid and 250 ml of 1 M sodium acetate. What will be the pH value of prepared buffer? The pK of acetic acid is 4.7. Calculate the pH of an acetate buffer composed of 0.2 M sodium acetate and 0.1 M acetic acid? The pKa for acetic acid is 4.76. Solve using the Henderson-Hasselbalch equation?

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