What is the pH of a solution with a concentration of 4.2 x 10−5 M H3O+? (4 points) Select one:
a. 2.31
b. 4.38
c. 5.62
d. 6.87

What is the pH of a solution with a 4.60 x 10−4 M hydroxide ion concentration? (4 points)

Select one:
a. 0.663
b. 3.33
c. 10.1
d. 10.7

1) b. 4.38

2)  d. 10.7

Explanation:

1) The problem tells us that [H₃O⁺] = 4.2x10⁻⁵ M, and keeping in mind that [H₃O⁺]= [H⁺], we can calculate the pH of the solution:

2) First we calculate the pOH of the solution:

Then we calculate the pH using the following formula:

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explanation: