1. Circle the acid/base pair that would serve best to prepare a buffer having a pH of 7.00.Cross out that which you would use to make a buffer at pH 3.50. Explain your answer. NaHSO4/Na2SO4 HNO2/NaNO2 HCl/NaOH NaH2PO4/Na2HPO4
2. How many moles of KF should be added to 0.50 L of a 0.10 M HF solution to prepare a buffer with a pH of 2.84?
3. Using the attached table, calculate the standard entropy change for the following reaction at 25°C: Ca(OH)2(s) ---- CaO(s) + H2O(g)
4. 50.0 mL of a 0.100 M CH3COOH solution is titrated with 0.100 M NaOH. What is the pH at the equivalence point?