An aqueous solution containing 10 g of an optically pure compound was diluted to 500 ml with water and was found to have a specific rotation of −135°. if this solution were mixed with 500 ml of a solution containing 8 g of a racemic mixture of the compound, what would the specific rotation of the resulting mixture of the compound? what would be its optical purity?

Answer asap need to be answered 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.