Which of the following is the correct Henderson-Hasselbalch equation?A. pH = pKa − log([A⁻]/[HA])B. pH = pKa + log([A⁻]/[HA])C. pOH = pKa + log([HA]/[A⁻])D. pH = log([H⁺])

23. Calculate the solubility product constant for aluminum hydroxide (Al(OH)3. Its molar solubility is     2.9 x 10–9 mole per liter at 25°C.           (a) 9.8 x 10–26                        (b) 4.9 x 10–26                        (c) 7.1 x 10–35           (d) 2.1 x 10–34                        (e) 1.9 x 10–33

A 0.10 M solution of ammonium chloride (NH₄Cl) is prepared. Given that Kb for NH₃ is 1.8 × 10⁻⁵, what is the approximate pH of the solution?A. 4.63 B. 7.00 C. 9.37 D. 11.13Hint: NH₄⁺ is a weak acid. First calculate Ka = Kw/Kb.

9. Given that the Ka for gallic acid, HC7H5O5, is 4.57 x 10-3, what is the Kb for sodium gallate, NaC7H5O5?              a) 4.57 x 10-3        b) 2.19 x 10-12           c)5.43 x 10-5         d) 7.81 x 10-5

A buffer contains acetic acid and sodium acetate. What happens when a small amount of HCl is added?A. The acetate ion reacts with H⁺.B. The acetic acid reacts with H⁺.C. The pH increases dramatically.D. The buffer is destroyed immediately.

8. Which one of the following pairs of acids and conjugate bases is incorrectly labeled and                   incorrectly matched.                        ACID                                 CONJUGATE BASE                 a)       HF                                                            F-                b)      HClO                                                        ClO-                c)      H2O                                                           OH-                d)      NH4+                                                         NH2-                e)      H3O+                                                         H2O

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Which factor does NOT affect equilibrium position?A. Temperature B. Pressure C. Catalyst D. Concentration

If a reaction quotient Q>K, the reaction:A. Proceeds forward B. Proceeds backward C. Is at equilibrium D. Stops

A nurse has begun having nightmares, irritability, and emotional distress after caring for multiple trauma patients over several months. Which intervention would be most appropriate?