A student needs to prepare a buffer solution with a pH of 5.73. Assuming a pKa of 4.06, how many mL of 0.1 M NaOH would need to be added to 15.0 mL of 0.1 M HB to prepare this buffer?

What mass of NaOH would be added to a one liter 0.200 M solution of acetic acid (pKa = 4.76) to adjust the final pH to 4.76?  Assume the NaOH won't significantly change the volume.  NaOH has a molar mass of 40.0 g.

What will be the pH of the final solution if 1.50 x 10-2 mol HCl solution is added to the buffer solution (100 mL) that contains 1.0 M HCN and 1.2 M NaCN?

7. A solution was made by mixing 50.0 mL of 0.750 M HCN with 25.0 mL of water. What is the pH of this solution? The pka of HCN = 9.31. 8. One of the compounds featured on the TV series "Breaking Bad" was hydrofluoric acid (HF), pKa = 3.14. a) A solution of HF has a pH = 1.77. What was the initial [HF] for this solution in mol L-1? b) What is the equilibrium concentration of F in this solution in mol L-1? c) What is the percent ionization of HF in this solution?

An aqueous solution contains 0.386 M dimethylamine ((CH3)2NH).How many mL of 0.379 M perchloric acid would have to be added to 250 mL of this solution in order to prepare a buffer with a pH of 10.800.