What is the pH at the equivalence point in the titration of a 21.6 ml sample of a 0.387 M aqueous nitrous acid solution with a 0.327 M aqueous barium hydroxide solution? pH =

A 0.247 g0.247 g sample of a monoprotic acid is dissolved in water and titrated with 0.140 M KOH.0.140 M KOH. What is the molar mass of the acid if 14.0 mL14.0 mL of the KOHKOH solution is required to neutralize the sample?

A student place 5 mL of a hydrochloric acid solution in an Erlenmeyer flask. She then added 23.5 mL DI water and 1 drops 0.2% phenolphthalein solution. During the titration, a faint, pale pink color was observed when 17.77 mL of 0.142 M barium hydroxide had been added. Calculate the concentration (in M) of the original hydrochloric acid solution.

You prepare a standard NaOH solution for the laboratory, using potassium hydrogen phthalate (KHC,H,O,, abbreviated KHP) as the primary standard. KHP (molar mass = 204.22 g/mol) has one acidic hydrogen. It took 31.55 mL of the NaOH solution to titrate (react exactly with) 0.750 g KHP. You then use the standard base solution to determine the amount of ascorbic acid in a 500.0 mg tablet of vitamin C. Ascorbic acid (HC̟H,O, molar mass 176.12 g/mol) also has one acidic hydrogen, and is usually mixed with some filler in preparing the tablets. It requires 19.14 mL of the NaOH to titrate (react exactly with) the ascorbic acid found in one 500.0 mg tablet. What is the percent vitamin C by mass in the tablet?