The table below shows the volume of two samples, a and b, when placed in three containers of different volumes. volume of sample volume of container volume of sample a volume of sample b 500 cm3 500 cm3 180 cm3 380 cm3 380 cm3 180 cm3 220 cm3 220 cm3 180 cm3 which of the following correctly describes the state of matter of one of the samples? a is a solid because its volume is equal to the volume of the containers. b is a gas because its volume is less than the volume of the containers. b is a solid because it contracts as the containers change. a is a gas because it contracts as the containers change.

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.