Vendothermicy 120
COMPLETE
100
D
80
E
Which of the following segments of the graph
represent a phase change in temperature?
Check all that apply.
A-B
Temperature,
degrees 60
Celsius
40
B-C
20
B
с
y
D
C-D
L50
50
D-E
100
А
-20-
<&
Heat added, KJ
E-F
DONE

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.