A 0.3147 g sample containing Na2CO3 was dissolved in 60 mL of distilled H2O and 2-3 drops of methyl orange were added to the mixture. The solution needed 38.73 mL of 0.1214 M HCl to reach the methyl orange end point. a. Calculate the number of millimoles of HCl needed to reach the methyl orange end point. b. How many millimoles of Na2CO3 reacted with the HCl? c. What is the mass(g) of Na2CO3 present in the sample? d. What is the %Na2CO3 present in the sample? please show your complete solution please:)