Calculate the molar concentration of a dilute Ba(OH)2 solution if (a) 50.00 mL yielded 0.1791 g of

Question:

Calculate the molar concentration of a dilute Ba(OH)2 solution if
(a) 50.00 mL yielded 0.1791 g of BaSO4.
(b) Titration of 0.4512 g of primary standard potassium hydrogen phthalate (KHP) required 26.46 mL of the base.
(c) Addition of 50.00 mL of the base to 0.3912 g of benzoic acid required a 4.67-mL back-titration with 0.05317 M HCl.