1. Lactic acid (CH3CHOHCOOH) has one acidic hydrogen. A 0.10 M aqueous solution of lactic acid has a pH of 2.43. Calculate the value of Ka for lactic acid. lactic acid CH3CHOHCOOH(aq) + H2O(l) W H3O+ (aq) + CH3CHOHCOO – (aq) Ka = ([H3O+ ][CH3CHOHCOO – ])/[CH3CHOHCOOH] [H3O+ ]eq = 10 – pH = 10 […]
1. For each of the following reactions, identify the Bronsted acid, the Bronsted base, the conjugate base, and the conjugate acid. Also, for each reaction predict whether the equilibrium lies predominantly on the reactants side or the products side. Refer to Figure 15.12 in the textbook. Remember a reaction will proceed from the stronger acid […]
1. Using the values of DHf° and S° provided, calculate the quantities listed below for the following phase change in ethanol, CH3CH2OH. CH3CH2OH(l) ⇄ CH3CH2OH(g) DHf° [CH3CH2OH(l)] = -277.69 kJ/mol DHf° [CH3CH2OH(g)] = -235.10 kJ/mol S°[CH3CH2OH(l)] = 160.7 J/mol·K S°[CH3CH2OH(g)] = 282.7 J/mol·K The sign of DS°total will inform us as to whether […]
1. Consider two identical four-atom solids, one having 4 quanta of energy and the other having 10. (a) What observable property differs between these two solids? The two solids have different amounts of thermal energy and will be at different temperatures. The four-atom solid with 10 energy quanta is at a higher temperature than the […]