Cu(NH3)4]2+ forms a blue solution. When concentrated HCl is added to this solution, what color will the solution change to?

How do I find the oxidation number of Fe?    cis−[Fe(en)2(NO2)2]+

Consider the equilibrium reaction below. [Cu(H₂O)6]²+ (aq) + 4 Cl (aq) light blue [CuCl4]² (aq) + 6 H₂O (1) orange A test tube contains a solution of Cu(NO3)2 which is light blue. What is the major species present in the solution responsible for the color?

Cobalt(II) complex ion solution:                                [Co(H2O)6]+2(aq)  +  4Cl-(aq)          [CoCl4]-2(aq)  +  6H2O(l)                                                         Pink                                                Blue   1). When silver nitrate is added the blue color becomes  pink.   Why is that ?  2. When heat is added , in which direction the equilibrium will shift ? Is this reaction exothermic or endothermic ?   3.What happens when the temperature is lowered in the ice bath ?

draw the structure of the possible product forthe following reaction, and how does the oxidation state of the metal ion formally change in this reaction? 1.trans-Ir(CO)Cl(PPh3)2+ H2→ 2. H3C-Mn(CO)5+ P(CH3)Ph2→(no gas evolved)

Write equilibrium reaction and solubility product constant for the following low solubility compounds, MnCO3, Hg(OH2), and Cu(PO4)2

Draw the molecular orbital diagram for [Ti(H2O)s]³+ with the electrons filled in the orbitals. Clearly label the bonding and anti-bonding orbitals.

[References] Excess silver nitrate is added to a solution containing 1.4 mol of [Co(NH3)4Cl2]Cl. What amount of AgCl (in moles) will precipitate? mol

Write the net ionic equation for the [CoCl4]?- ion/[Co(H2O)6J²+ ion equilibrium.

For [Co(NH3)6]3+ , Kf has a value of 5.00 × 1031. Calculate the concentration of free, uncomplexed Co3+ ions in a solution that contains a total of 0.160 mol/L cobalt III ions and an equilibrium concentration of 0.50 M NH3.