1.660g of an unknown diprotic acid are used to make a 100.00mL solution. Then 25.00mL of this solution is transferred to an Erlenmeyer flask and is titrated with 0.1065 M NaOH. The titration endpoint is reached after 0.00477 mol of NaOH is added using the burette. What is the molar mass of the diprotic acid?

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.