6. A mixture contains at least one of the ions in the silver group (Ag*, Hg²*, Pb²*). Read the following procedure and determine which ions are present. Cold 6M HCl was added to the mixture producing a white precipitate. Hot water was then added and the solution was stirred, and the supernatant decanted to isolate a white precipitate after centrifugation. Sulfuric acid was added to one portion of the supernatant and potassium chromate was added to a second portion of the supernatant, but no precipitates formed. The isolated white precipitate was mixed well with 4 drops of concentrated ammonia. The resulting solution was centrifuged. The supernatant was decanted to show the grayish-black precipitate. To the supernatant, concentrated nitric acid was added dropwise until blue litmus paper added turned red and a white precipitate was present. presence of a

The formation constant of a complex ion [M(NH3)4]2+(aq) is 1.8E8. If a solution is prepared by adding 0.3 mol of [M(NH3)4]Cl2 to 850.0 mL of water, what is the equilibrium concentration of free M2+(aq) ions?

Hard water is a problem for many residential and commercial applications. How can hard water be treated, or "softened"? By filtering the solution with charcoal O By adding CaCO3 and MgCO3 By exchanging Ca²+ and Mg2+ ions for Na+ and/or adding a chelating ligand O By electrolysis of the solution

。 A 0.140 mol quantity of CoCl₂ is added to a liter of 1.20 M NH3 solution. What is the concentration of Co²+ ions at equilibrium? Assume the formation constant* of Co(NH3)² + is 5.0 × 10³¹ M−6. concentration: M

The equilibrium-constant expression for the reaction Ti (s) + 2CI 2 (g) TICI 4 (1) is given by O [Ti (s)] [Cl2 (g)F [TIC14(1}] [TIC14 (1)] [Ti (s)] [Cl2( g))? [TIC14 (1)] [Ti (s)] [Cl2 (g)] O [TIC14 (1)] [Cl2 (g))? O [Cl2 (g)]2

Write the balanced NET ionic equation for the reaction when Mn(C₂H₃O₂)₄ and (NH₄)₂S are mixed in aqueous solution. If no reaction occurs, simply write only NR.

Complete and balance the following reactions (if no reaction, write NR): Co(II) + HCl, Hg + HCl, Zn + Ni(NO3)3, Cu + H2SO4 (concentrated).

1. What is the balanced net ionic equation for the equilibrium involving complex ions, CoCL42- and [Co(H2O)6]2+. 2. When heating the mixture the color was blue and when cooled it was pink. Based on this, is the forward reaction endothermic or exothermic and why? What is the balanced net ionic equation when heat is included?  3. How could an alcohol solution of CoCL2 beused to predict rain?

What is the concentration of [Ag(S2O3)2]3- in a solution which contains 7.5 x 10-7 M Ag+ ions and 1.5 x 10-6 M S2O32- ions?   The Kf for [Ag(S2O3)2]3- is 4.7 x 1013.

Use the data provided for stock concentration and mass to calculate the concentrations of each solution.  Solution A) A stock solution of 0.0100 M solution of K3[Fe(CN)6] is provided. Calculate the volume of the stock solution needed to prepare 100.0 ml of .00200 M K3[Fe(CN)6]. Deionized water should be used to dilute the solution. Solution B) Calculate the volume of solution A needed to prepare 50.0 ml of .0010 M K3[Fe(CN)6]. Deionized water should be used to dilute this solution.