Question

Mg(OH)2 is a sparingly soluble salt with a solubility product, Kp, of 5.61 x 10-1 t is used to control the pH and provide nutrients in the biological The common-ion effect is an application of Le Châtelier's principle, which states that an equilibrium system that is stressed will work to alleviate that stress and reestablish equilibrium. (microbial) treatment of municipal wastewater streams. What is the ratio of solubility of Mg(OH)2 dissolved in pure H2O to Mg(OH)2 dissolved in a 0.190M NaOH solution? Express your answer numerically as the ratio of molar solubility in H2O to the molar solubility in NaOH Hints Submit My Answers Give Up The common-ion effect and buffer systems A buffer is a mixed solution of a weak acid or base, combined with its conjugate. Note that this can be understood essentially as a common-ion problem: The conjugate is a common ion added to an equilibrium system of a weak acid or base. The addition of the conjugate shifts the equilibrium of the system to relieve the stress of the added concentration of the common ion. In a solution consisting of a weak acid or base, the equilibrium shift also results in a pH shift of the system. It is the presence of the common ion in the system that results in buffering behavior, because both added H or OH lons can be neutralized. Part B What is the pH change of a 0.270 M solution of citric acid (pK, 4.77) if citrate is added to a concentration of 0.165 M with no change in volume? Express the difference in pH numerically to two decimal places. Hints Submit My Answers Give Up

Answer 1

art A -t 2011 Ma (oH) 2.S sp 5 G Ix16 S= 2.41x10 in Naott. sP ratio 2.tt x1o/ ● 155 x10 Yatro = 1.55 x 105 Cltricand 4.56