Calculate the pH of a buffer that is 0.020 M HF and 0.040 M LiF.  The Ka for HF is 

Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH₄Cl with 100.0 mL of 0.20 M NH₃.  The Kb for NH₃ is 1.8 x 10^-5.

You wish to prepare an HC₂H₃O₂ buffer with a pH of 4.24.  If the pKa is 4.74, what ratio of C₂H₃O₂⁻/HC₂H₃O₂ must you use?

The highest pH for an effective buffer occurs when the base is how many times as concentrated as the acid?

A 100.0 mL sample of 0.18 M HClO₄ is titrated with 0.27 M LiOH.  Determine the pH of the solution after the addition of 30.0 mL of LiOH.

Which of the following compounds will have the highest molar solubility in pure water?

Which of the following compounds solubility will not be affected by a low pH in solution?

Determine the molar solubility of CuCl in a solution containing 0.050 M KCl.  

Ksp (CuCl) = 1.0 E-6.