8) In the reversible reaction [Co(H,O)6]²*(aq) + 4CI (aq) →[Co(H,O),Cl.]² (aq) + 4H;O(I), the initial color of the reaction mixture was pink. When concentrated HCI (aq) was added to the reaction mixture, the color changed to purple. Which reactant is purple and why? a) [Co(H;O)6]²*(aq) is purple because it is a cobalt compound b) [Co(H2O)6]²*(aq) is purple because adding Cl (as HCI) shifted the reaction towards products c) HCl is purple because adding it turned the reaction purple d) [Co(H,O),Cl.] (aq) is purple because adding Cl (as HCI) shifted the reaction towards products Text Predictions: On Accessibility: Investigate D Focus e to search 99+

In an aqueous chloride solution cobalt(II) exists in equilibrium with the complex ion CoCl². Co²+ (aq) is pink and CoC14² (aq) is blue. At low temperature the pink color predominates. At high temperature the blue color is strong. If we represent the equilibrium as: Co²+ (aq) + 4C1 (aq) = CoCl₂² (aq) We can conclude that: 1. This reaction O exothermic. O endothermic. Oneutral. O More information is needed to answer this question. 2. When the temperature is increased the equilibrium constant, K: O increases. Odecreases. O remains the same. O More information is needed to answer this question. 3. When the temperature is increased the equilibrium concentration of Co²+: O increases. Odecreases. O remains the same. OMore information is needed to answer this question. Previc

11.) If the equilibrium constant for the reaction in part c.) in the previous problem is 5.0 x 104 at 25°C, what is the equilibrium constant for the reaction below?Ni(CO)4 (g) <---> Ni (s) + 4 CO (g) c.) kc= [Ni(CO)4]/ [CO]4

A solution contains 1.0 x 105 M NazPO4. What is the minimum concentration of AGNO3 that would cause precipitation of AgiPO4(s). (Ksp for this compound can be found in your book) 9. Cobalt(II) reacts with ethylenediamine (abbreviated "en") to form [Co(en)3]2 (Kr= 8.7 x 103). What is the concentration of uncomplexed cobalt(II) ion in a solution initially containing 0.0100 M Co2* and 0.400 M ethylenediamine? 10.