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3. At high pH, some metals precipitate as metal hydroxides. For cadmium, the equilibrium constant for...
2. Cadmium is a toxic metal used to produce batteries and some plastics. Cadmium ion (Cd?)...
2. Cadmium is a toxic metal used to produce batteries and some plastics. Cadmium ion (Cd?) is an inhibitor of hexokinase. Increasing the concentration of the substrates of hexokinase (glucose, ATP, and Mg) does not change the rate of reaction. What type of inhibitor is cadmium for hexokinase? Explain your answer.
3. Insoluble metal hydroxides can be used as a "buffer" to resist changes in pH. For example, con...
3. Insoluble metal hydroxides can be used as a "buffer" to resist changes in pH. For example, consider the solution that would sul if 0.200 moles of MgCl2 are combined wih0.200 moles of NaOH in a total volume of 1.00 liter a) Determine the concentrations of all ionic species in this solution b) Calculate the pH of this solution c) You could add 0.040 moles of NaOH to the solution in part (a), causing additional Mg(OH)2 to precipitate. Calculate the...
2. (12 points). You need to soften a water that has high concentrations of dissolved calcium...
2. (12 points). You need to soften a water that has high concentrations of dissolved calcium and magnesium. (a) You measure the Cat concentration as 55 mg/L and the Mg concentration as 10 mg/L. What are these concentrations in units of mM? (b) One possible treatment operation to soften the water is to precipitate the calcium and magnesium as solids. The total carbonate species here is 16 mm. In this case, you recommend raising the pH where both CaCO., and...
(a) Determine the equilibrium constant of Mg(OH)2(s) dissolution at 25 oC. (b) For a solution containing...
(a) Determine the equilibrium constant of Mg(OH)2(s) dissolution at 25 oC. (b) For a solution containing 10-3 M dissolved Mg, at what pH will Mg(OH)2(s) precipitate?
An acidic solution is 2 mM in each of the following metal ions: Zn2+, Cu2+, Co2+,...
An acidic solution is 2 mM in each of the following metal ions: Zn2+, Cu2+, Co2+, Ca2+. a) Which of the metals would precipitate as their hydroxides at pH = 6.00? (Select all that apply. See theappendix.) -zinc -copper -cobalt -calcium b) Which of the metals would precipitate as their hydroxides at pH = 8.00? -zinc -copper -cobalt -calcium c) At what pH do the metal hydroxides begin to participate? Zn(OH)2 ____ Cu(OH)2 ____ Co(OH)2 ____ Ca(OH)2 ____ Substance Ksp...
Write the equilibrium-constant expression for the reaction shown in terms of [NO], [0, 1, and [NO,...
Write the equilibrium-constant expression for the reaction shown in terms of [NO], [0, 1, and [NO, J. 2 NO(g) + O2(g) = 2 NO, (g) Ke, which is sometimes symbolized as Kor Key, denotes that the equilibrium constant is expressed using molar concentrations. For this question, Kmeans the same thing as K and Ke. K. = [C] [D]2 [4][B] At 25 °C, only 0.0670 mol of the generic salt AB, is soluble in 1.00 L of water. What is the...
1. (15 pts) Use Ksp value (1E-32) and solubility reaction for aluminum hydroxide, AI(OH)3, found in...
1. (15 pts) Use Ksp value (1E-32) and solubility reaction for aluminum hydroxide, AI(OH)3, found in Table 2.3 (p.62). pH is fixed at 6.0. What is the solubility of aluminum hydroxide? Report your result as the concentration of the aluminum metal cation in M units. Assume an infinite solid. Explain briefly how your result does or does not match the curves shown in the figure in class notes (see the graph for amorphous aluminum hydroxide solubility as a function of...
Given the Ksp of Zn(OH)2 is 3.0x10-1, determine the Zn2 ion concentration when the pH of...
Given the Ksp of Zn(OH)2 is 3.0x10-1, determine the Zn2 ion concentration when the pH of the solution is buffered to pH=12.00 (so that the hydroxide ion concentration is 0.010 M). 1. Zn(OH)2(s) A. [Zn2] 3.0x10-12 M B. [Zn2 3.7x10- M C. [Zn23.0x10-10 M D. [Zn2] 9.1x10-3 M E. [Zn2] 1.5x10-13 M Zn2 (aq) + 20H (aq) Ksp 3.0x10-16 2. When silver carbonate, Ag,COs, is mixed with water, it dissolves to some extent to form a saturated solution where the...
5. The nickel-cadmium battery, despite issues with the toxicity of Cd, is still used in some...
5. The nickel-cadmium battery, despite issues with the toxicity of Cd, is still used in some rechargeable batteries because it has very consistent voltage over long discharge times. a) Using only half-cell reactions given in Table 16.1, write the overall reaction and give the highest AV° value possible for a NiCd battery. b) The actual half-cell reactions used in a Nicd battery are: Ca(OH)2(8) + 2e → Cds + 2OH(aq) (Vº = -0.86V) NiO(OH)) + H2O) +e Ni(OH)2(s) + OH(aq)...
2. Cadmium is a toxic metal used to produce batteries and some plastics. Cadmium ion (Cd?) is an inhibitor of hexokinase. Increasing the concentration of the substrates of hexokinase (glucose, ATP, and Mg) does not change the rate of reaction. What type of inhibitor is cadmium for hexokinase? Explain your answer.
3. Insoluble metal hydroxides can be used as a "buffer" to resist changes in pH. For example, consider the solution that would sul if 0.200 moles of MgCl2 are combined wih0.200 moles of NaOH in a total volume of 1.00 liter a) Determine the concentrations of all ionic species in this solution b) Calculate the pH of this solution c) You could add 0.040 moles of NaOH to the solution in part (a), causing additional Mg(OH)2 to precipitate. Calculate the...
2. (12 points). You need to soften a water that has high concentrations of dissolved calcium and magnesium. (a) You measure the Cat concentration as 55 mg/L and the Mg concentration as 10 mg/L. What are these concentrations in units of mM? (b) One possible treatment operation to soften the water is to precipitate the calcium and magnesium as solids. The total carbonate species here is 16 mm. In this case, you recommend raising the pH where both CaCO., and...
Write the equilibrium-constant expression for the reaction shown in terms of [NO], [0, 1, and [NO, J. 2 NO(g) + O2(g) = 2 NO, (g) Ke, which is sometimes symbolized as Kor Key, denotes that the equilibrium constant is expressed using molar concentrations. For this question, Kmeans the same thing as K and Ke. K. = [C] [D]2 [4][B] At 25 °C, only 0.0670 mol of the generic salt AB, is soluble in 1.00 L of water. What is the...
1. (15 pts) Use Ksp value (1E-32) and solubility reaction for aluminum hydroxide, AI(OH)3, found in Table 2.3 (p.62). pH is fixed at 6.0. What is the solubility of aluminum hydroxide? Report your result as the concentration of the aluminum metal cation in M units. Assume an infinite solid. Explain briefly how your result does or does not match the curves shown in the figure in class notes (see the graph for amorphous aluminum hydroxide solubility as a function of...
Given the Ksp of Zn(OH)2 is 3.0x10-1, determine the Zn2 ion concentration when the pH of the solution is buffered to pH=12.00 (so that the hydroxide ion concentration is 0.010 M). 1. Zn(OH)2(s) A. [Zn2] 3.0x10-12 M B. [Zn2 3.7x10- M C. [Zn23.0x10-10 M D. [Zn2] 9.1x10-3 M E. [Zn2] 1.5x10-13 M Zn2 (aq) + 20H (aq) Ksp 3.0x10-16 2. When silver carbonate, Ag,COs, is mixed with water, it dissolves to some extent to form a saturated solution where the...
5. The nickel-cadmium battery, despite issues with the toxicity of Cd, is still used in some rechargeable batteries because it has very consistent voltage over long discharge times. a) Using only half-cell reactions given in Table 16.1, write the overall reaction and give the highest AV° value possible for a NiCd battery. b) The actual half-cell reactions used in a Nicd battery are: Ca(OH)2(8) + 2e → Cds + 2OH(aq) (Vº = -0.86V) NiO(OH)) + H2O) +e Ni(OH)2(s) + OH(aq)...
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