Phosphate buffers are important in regulating the pH of intracellular fluids at pH values generally between 7.1 and 7.2. a. What is the concentration ratio of H2PO4 to HPO4 2 in intracellular fluid at pH 7.15? b. Why is a buffer composed of H3PO4 and H2PO4 ineffective in buffering the pH of intracellular fluid?
CEM 141 Lecture 29: VSEPR Dr. Jian Hu November 11 , 2016 Extracting Information from Lewis Structures Valence Shell Electron Pair Repulsion theory (VSEPR): helps to determine molecular shape from the Lewis Structure It makes the assumption that centers of electron density repel one another Single bonds, double bonds, triple bonds, and lone pairs of electrons all count as one center of electron density each The atom will naturally take up an arrangement of minimum energy Electron Center Geometry 2 centers of electron density have sp hybridization, and are considered to be linear; bond angle is 180 degrees (ex: CO ) 2 2