Consider the following chemical reaction 2HCl+Ca(OH) CaCl+2H2O you have a mixed solution with 20.00mL of 0.100M Ca(OH)2 solution What is the molarity of the HCl,Ca(OH)2 and CaCl2 after the reaction has stopped?

This can't be answered. You didn't include the concn and mL HCl. I worked the complete problem yesterday so it should be on this site somewhere.