\If 22 mL of 0.26M MgCl2 is needed to completely react 15 mL of AgNO3 solution, what is the molarity of AgNO3? Hints: First balance the double displacement reaction between MgCl2 (aq) and AgNO3 (aq). Then calculate the number of moles of magnesium chloride. Then convert that to moles of silver nitrate. Then work out the concentration of silver nitrate. Do each step separately instead of all-in-one line to check that you definitely understand the meaning of each step instead of a process of just units cancelling. The Molarity unit symbol is M.