9. EDTA and other similar chelating agents are frequently used in cleaning products. Briefly explain how a cleaning product containing EDTA can aid in removing hard water soap scum from a sink. Would the presence of EDTA in a soap powder help prevent soap scum formation in hard water? Briefly explain. a) Yes, it will help, cause EDTA is a chelating agent able to bind to Ca2+ and Mg 2+ O ions (responsible for water hardness and soap scum formation) and therefore making these two ions inactive b) Yes, it will help, cause EDTA is a chelating agent able to bind only to Ca2+ O (responsible for water hardness and soap scum formation) and therefore making this ion inactive c) Yes, it will help, cause EDTA is a chelating agent able to bind only to Mg2+ (responsible for water hardness and soap scum formation) and therefore making this ion inactive O d) It will not help at all. It is complicated!

After completing the experiment, a student finds that the equilibrium concentrations of the reactants and product are as follows. Calculate the equilibrium constant for the complex ion formation. [SCN¯]eg= 6.45x10-4 M %3D [Fe3+]eg = 8.42x10-4 M leq [FENCS2+]eg = 1.50x10-4 M %3D

Please don't provide handwritten solution ....

a. A lab student analyzed a cooled Ni-en complex to determine the ethylenediamine, en, content. A 0.334 g sample of the synthesized Ni-en complex was dissolved in about 50 mL of water and titrated with 0.243 M HCI (aq). Endpoint required 21.01 mL of the HCI (aq). What is the mass (in grams) of en (MW of en = 60.10 g/mole) in the Ni-en complex analyzed? g en + 2 HCI H₂en²+ + 2 CI™ b. Continuing on with the analysis of the Ni-en complex as found in part a, 30 mL of dimethylglyoxime (DMG) solution was added to the 0.334 g of the titrated Ni-en complex solution. The resulting beautiful red complex, Ni(DMG)2 (MW = 288.94 g/mole) was collected by filtration and found to weigh 0.233 g after 20 minutes in the oven. What is the mass (in grams) of Ni in the Ni-en complex analyzed? Ni²+ + 2 DMG → Ni(DMG)2 (s) CD. [Ni(en)3]SO4.7H₂O CE. [Ni(en) (H20)4]SO4-4H₂0 9 c. Determine the empirical formula of the complex synthesized in parts a and b. A. [Ni(en)3]SO4-4H₂0 B. [Ni(en)2(H₂O)₂]SO4-3H₂0 C.…