Question 4 What is the pE of O 2 -saturated water when the pH of the water is 4.

Question

Question 4

What is the pE of O2-saturated water when the pH of the water is 4.97? (PO2 = 0.21 atm, Ecell = 1.2263)

8.57

15.61

11.30

7.03

4.39

1 points   

Question 5

What is the ratio of NH4+ to NO2- in O2-saturated water when the pH is 8.20 and the pE is 4.42? (Ecell = 0.895)

0.052

1.88 x 10-5

8.92

19.2

3.55

1 points   

Question 6

Consider the table of equilibrium constant values given below for a given set of conditions. What will be the concentration of [HCO3-] in water that is in equilibrium with both CaCO3 (s) and 225 ppm CO2 (g) under these conditions?

1.6 x 10-3 M

7.9 x 10-4 M

8.1 x 10-3 M

3.9 x 10-4 M

5.6 x 10-4 M

8.57

15.61

11.30

7.03

4.39

Explanation / Answer

1. 7.03

5. 8.92

6 8.1 x 10-3 M

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