Astudent collected data on several samples of a substance that looked like gold. each sample's mass was
taken. the same student used water displacement to determine the volume of each sample. the data is
recorded below:
sample
mass
initial volume
final volume
به نا
50.25 g
63.56 g
57.65 g
50.1 ml
49.8 ml
50.2 ml
60.3 ml
62.5 ml
61.5 ml
questions
how many significant figures is each mass measurement? how about volume?
there is 4signica
u significant figures in the mass measurement and
3 significant figures in volume.
calculate the density of each sample. be sure to record to the correct number of significant figures.
2

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.