Question
Asked Oct 14, 2019
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Buffering Capacity

Which group is water, which group is phosphate salt, and which group is optimen media from the graph? How can you tell?

Buffering Capacity pH vs. Volume of Base
12 y 0.0004x3-0.0238x2+ 0.4761x+ 7.797
R2 1
y 0.0005x0.0211x +7.314
Group 1
10
R 1
Group 2
8
y=9E - 06x 2 + 0.0055x+ 7.2604
R2 1
Group 3
O 6
Log. (Group 3)
Power (Group 3)
4
Poly. (Group 3)
0
0
50
100
150
200
250
300
Volume of Base
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Buffering Capacity pH vs. Volume of Base 12 y 0.0004x3-0.0238x2+ 0.4761x+ 7.797 R2 1 y 0.0005x0.0211x +7.314 Group 1 10 R 1 Group 2 8 y=9E - 06x 2 + 0.0055x+ 7.2604 R2 1 Group 3 O 6 Log. (Group 3) Power (Group 3) 4 Poly. (Group 3) 0 0 50 100 150 200 250 300 Volume of Base

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Expert Answer

Step 1

The pH of water increases sharply because the concentration of hydroxyl ions increases suddenly on the addition of a strong base that makes group 3 water.

Step 2

The reaction of the aqueous solution of a phosphate salt, NaH2PO4 is given below. On addition of the base, the reaction will shift in the backward direction. S...

=H,PO, +OH
NaH,PO H2O
4
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=H,PO, +OH NaH,PO H2O 4

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