The equilibrium constant for the ion-pairing reaction Mg2*(aq) + So (aq) = MgSO,(aq) is Kjon pair= 1.70 x 102. Consider a 0.0270 F solution of MgSo̟. Neglecting other reactions except the autoionization of water, what is the charge balance equation for this solution? O [Mg²+1 = [SO;] O 2 ĮMg24) = 2[SO; O [Mg2+1 + [H*] = [So]+[OH¯] O 2 [Mg2+] + [H*] = 2[SO+ [OH¯] %3D

Consider the following reaction, which is endothermic in the forward direction Fe+3(aq) + NCS-(aq) ↔ FeNCS+2 (aq)               yellow.           colorless      blood red If Fe+3 can make complex ions with chloride ions and hydrogen phosphate ions, can be reduced by Sn2+ ions, and can precipitate with hydroxide ions (becoming colourless in all cases), what would be the colour of the equilibrium under the condition of the following stressors? (ie. Which way would it shift)  The addition of HCl The addition of strong base The addition of Fe(NO3)3 Heating the solution Increasing the pressure surrounding the solution

At 300 K, the Ko of the reaction 2 NH3(0) N29) + 3 H2(a) is equal to 3.2 x 109. Which of the following will give the equilibrium constant of the formation reaction of NH3(9) at the same temperature? O (Ko)? O (Ko)1/2 O (Kc)1/2 O (Ko)1

A highly acidic (pH<0.5) industrial wastewater has an initial AP* concentration of 10 ppm. An engineer decides that strong base should be added to the wastewater in order to raise the pH so that most of the aluminum will precipitate and be removed from solution. The pertinent solubility reaction from Appendix A of our text is: Al(OH); (s) → A* + 3OH¯ with pK, = 32.9 a. What is the lowest pH needed to precipitate all but 50 ppb of the aluminum from the wastewater? Assume equilibrium conditions can be achieved. b. Suppose the engineer decides that the pH should be raised to 7. What equilibrium concentration of aluminum would be left in solution? Report your answer in ppb and moles per liter.

Phosphate buffered saline (PBS) is buffered to a pH of 7.40, the pH of human blood, with the H₂PO4/HPO4²- system. Calculate the mole ratio of H ₂PO4 :HPO 42 needed to maintain this pH. K₂ = 6.31 x 10-8 8:1 1:2 1.6:1 3:10 20:1

2. The molar conductance of an acidic aqueous solution of [Co(NH)sCO.JNO, changes rapidly with time. Would you expect it to increase or decrease? What values are expected for the molar conductivity (Am) upon complete hydrolysis?

Gg.31.

Write the equilibrium constant expression for this reaction: 2Li*(aq) +Co (aq) Li,CO,(s) X log, cos, K =

Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated NaOH(aq). Calculate the amount of Ga(s) that can be deposited from a Ga(III) solution using a current of 0.540 A that flows for 50.0 min.

Predict the products and balance the following eqn. and identify the type of reaction Mg + Br (8) Feco > 3(s)