A certain mineral has a cubic unit cell with calcium at each corner, oxygen at the center of each face, and titanium at its body center. What is the formula of the mineral? An alternate way of drawing the unit cell has calcium at the center of each cubic unit cell. What are the positions of titanium and oxygen in such a representation of the unit cell? How many O2- Cl- O2- Na+ Cl- O2- Cl- Na+ O2- Na Cl-. +, O2-, -2.5 * 103 kJ molMgCl -1. 2, NaCl2 Hf[NaCl2(s)] NaCl21s2 oxygen atoms surround a particular titanium atom in either representation?
Chemistry of Solutions Lecture 11 Tuesday, October 4, 2016 Exercise Continued: calculate the pH of a 1.00x10 M H SO solution, for2the 4econd dissociation of H SO2. 4 The major species are H + , HSO - , and H O . (aq) 4 (aq) 2 (l) -2 -3 K a 1.2 x 10 , don't approximate because K must be at aeast 10 smaller than the initial concentration of H SO 2 4 1.2x10 = [HSO ] [H ]4/ [H SO ] 2 4 -2 -2 -2 1.2x10 = (1.0x10 + x) (x) / (1.0x10 – x) (1.2x10 )(1.0x10 – x) = (1.0x10 + x ) -2 2 Using the Quadratic Equation: a = 1, b = 2.2x10 , c = -1.2x10 . -4 -2 -