At elevated temperatures, sodium chlorate decomposes to produce sodium chloride and oxygen gas. a 0.8765-g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. the oxygen gas collected over water occupied 57.2 ml at a temperature of 22ºc and a pressure of 734 torr. calculate the mass percent of nahco₃ in the original sample. (at 22ºc the vapor pressure of water is 19.8 torr.)

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.