What is the isoelectric point, pl, for the pentapeptide, MGHFD 4.8 3.1 Show work O 7.8 2.3 O 9.5

NH3 has a dipole moment of 1.47 D. Consider the interaction energy between Na+ and NH3 in an aqueous solution with a separation distance of 0.2 nm. (εH2O = 80.10) Calculate the interaction potential for each of the ion-dipole orientations shown below and determine the orientation with the lowest potential energy.

?CaSO4+AlCl3→CaCl2+Al2(SO4)3     Whats ?

Suppose a chloride ion and a sodium ion are separated by a center–center distance of 5 Å. Is the interaction energy (the energy required to pull them infinitely far apart) predicted to be larger if the medium between them is water, or if it is n-pentane?  If Ca 2+, Na+, and F - each have ionic radii ∙1.16. Which ionic bond is stronger: Ca-F or Na-F? If Ca 2+ is often bound on the surface of a protein by carboxylic acid functional groups. If the pKa of a particular ¬COOH group is 4.2, would you predict Ca 2+ to be most tightly bound at pH 8, pH 4.2, or pH 3? Explain your answer.