Mastering Biol_ Ch 2B Study Guide Test 2024.

Mastering Biol_ Ch 2B Study Guide Test 2024.Which statement is true of pH buffers? Which statement is true of pH buffers? (a) They consist of strong acids and strong bases. (b) They keep the pH of the blood constant. (c) They consist of weak acids and weak bases. Both (a) and (b). Both (b) and (c). - correct answer (c) They consist of weak acids and weak bases. A buffer consists of undissociated acid (HA) and the ion made by dissociating the acid (A-). How does this system buffer a solution against decreases in pH? A buffer consists of undissociated acid (HA) and the ion made by dissociating the acid (A-). How does this system buffer a solution against decreases in pH? (a) HA dissociates and releases H+ and A- into solution. (b) A- reacts with H+ to become HA. (c) As the solution loses H+, HA replaces the lost H+. Both (a) and (c). None of the above. - correct answer (b) A- reacts with H+ to become HA. Buffers work best when ... about half of the buffer molecules are dissociated. nearly all of the buffer molecules are undissociated. the ratio of H+ to OH- is close to 1.0. the pH is nearly neutral. 5% nearly all of the buffer molecules are dissociated. - correct answer about half of the buffer molecules are dissociated.