1.Using EDTA as the titrant and a free metal in solution is called a direct titration. This can be measured using an indicator that changes color when the metal is no longer in solution. What are the other types of EDTA titrations that can be done and why would you choose to do one of those?2.What is the formation constant for calcium with EDTA? Are there any challenges with doing a direct titration with Ca2+? If so what would be the alternative titration to do (see your answers for #1)3.List and explain some of the commercial usesfor EDTA.