![]() ![]() These ideas appear foreign to us because they are inconsistent with our experience of the macroscopic world. The key new concepts developed in quantum mechanics include the quantiza-tion of energy, a probabilistic description of particle motion, wave–particle duality, and indeterminacy. ![]() This was undoubtedly one of the most signiicant shifts in the history of science. ġ83 philosophical implications of quantum mechanics and develop a new way of thinking about nature on the nanometer-length scale. To demonstrate that this statement is true, Example 15-1 shows how a titration curve can be constructed for a solution containing roughly equal concentrations of HCl and HA, where HA is a weak acid with a dissociation constant of 10 24. Each of the components in a mixture containing a strong acid and a weak acid (or a strong base and a weak base) can be determined provided that the concentrations of the two are of the same order of magnitude and that the dissociation constant for the weak acid or base is somewhat less than about 10 24. For more than one equilibrium, chemical reactions and algebraic equations are required to describe the characteristics of any of these systems. We define complex systems as solutions made up of (1) two acids or two bases of different strengths, (2) an acid or a base that has two or more acidic or basic functional groups, or (3) an amphiprotic substance, which is capable of acting as both an acid and a base. I n this chapter, we describe methods for treating complex acid/base systems, including the calculation of titration curves. Calculations of pH and of titration curves are also described. The pH of human blood is controlled to be within the range of 7.35 to 7.45, primarily by the carbonic acid-bicarbonate buffer system: CO 2 (g) 1 H 2 O(l) 8 H 2 CO 3 (aq) H 2 CO 3 (aq) 1 H 2 O(l) 8 H 3 O 1 (aq) 1 HCO 3 2 (aq) This chapter describes polyfunctional acid and base systems including buffer solutions. ![]() Shown here is a scanning electron micrograph of red blood cells travel-ing through an artery. The human body contains a complicated system of buffers within cells and within bodily fluids, such as human blood. Polyfunctional acids and bases play important roles in many chemical and biological systems. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |