One millimole of Ni(NO3)2 dissolved in 250.0 mL of a solution that is 0.500 M  in ammonia. The formation constant of Ni(NH3)62+ is  5.5×108. 0.004 M is the initial concentration of Ni(NO3)2 in the solution.   What is the equilibrium concentration of Ni2+(aq ) in the solution?

Phosphate buffers are important in regulating the pH of intracellular fluids. If the concentration ratio of H2PO4/HPO42 in a sample of intracellular fluid is 1.1: 1, what is the pH of this sample of intracellular fluid? H2PO4(aq)HPO42(aq)+H+(aq)Ka=6.2108

The active ingredient of Pepto-Bismol is the compound bismuth subsalicylate, which undergoes the following dissociation when added to water: C7H5BiO4(s)+H2O(l)C7H4O32(aq)+Bi3+(aq)+OH(aq)K=? If the maximum amount of bismuth subsalicylate that reacts by this reaction is 3.2 1019 mol/L, calculate the equilibrium constant for the preceding reaction.

What are the main equilibria involved in the CO2–Carbonate system and what kind of equilibrium constant is associated with each (K?)?

The preparation of cis-platin [Pt(NH 3) 2CI 2], an anticancer drug, uses an equilibrium reaction: K 2PECI 4(aq) + 2NH 3(aq) = 2 KCI(aq) + Pt(NH 3) 2CI 2(aq). Which of the following conditions would lead to an increase in the amount of Pt(NH 3) 2CI 2 formed? The use of a low concentration of NH3 The addition of a large concentration of KCI The use of a large concentration of NH3 The use of a stoichiometric ration of K2PTCI4 and NH3

Calculate the equilibrium concentration of Zn2+(aq) in a solution that is initially 0.150 M Zn(NO3)2 and 0.800 M NH3.   The formation constant for [Zn(NH3)4]2+(aq) is Kf = 2.8 × 109.

One millimole of Ni(NO3)2 dissolves in 240.0 mL of a solution that is 0.500 M  in ammonia.The formation constant of Ni(NH3)62+ is  5.5×108.    What is the initial concentration of Ni(NO3)2 in the solution? What is the equilibrium concentration of Ni2+(aq ) in the solution?

Calculate the silver ion concentration, [Ag'], of a solution prepared by dissolving 1.00 g of AgNO3 and 10.0 g of KCN in sufficient water to make 1.00 L of solution. (Hint: Because k is very large, assume the reaction goes to completion then calculate the [Ag). RAg" (aq) + 2CN (aq) = Ag(CN)2(aq) kr = 1.0 x 1021 42 1g AgNO3 Helpful hint : You will need: AgNO3 = 169.989 1 mol AgNO3 169.98 g AgNO3 mol 5.89 x 103 mol Ag KCN = 65.12 3 mol 19KCN 1 mol KCN 65.12 g KCN 0.154 mol CN-

The solubility of Cl, in 100 g of water at STP is 310 cm³. Assume that this quantity of Cl2 is dissolved and equili- brated as follows: Cl2(aq) + H20 = cl (aq) + HCIO(aq) + H*(aq) (a) If the equilibrium constant for this reaction is 4.7 x 10-, calculate the equilibrium concentration of HCIO formed. (b) What is the pH of the final solution?

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