In а neutrаlizаtiоn titratiоn, an accurately measured vоlume of HCl solution was added to an Erlenmeyer flask, along with a few drops of phenolphthalein indicator solution. A standardized NaOH solution was delivered from a buret to the reaction mixture. The standardized NaOH solution delivered from the buret is called the _________________ and the instant when the indicator changed color to indicate neutralization was complete is called the _________________________. Choose from the following words. primary standard indicator titration titrant end-point molarity [BLANK-1]