What is the pH of a solution with [H3O+] = 7.2 x 10-4 M?
Select one:
A. 4.72
B. 7.20
C. 4.00
D. 3.14
Answers
Answered by
0
Answer:
7.20 (b)
Explanation:
the ph of a solution is 7.20
Answered by
0
Answer:
The pH of the solution is 3.14.
Explanation:
The pH of a solution is defined as the negative logarithm to the base ten of the activity of hydrogen ion. Since pH is a logarithmic scale, a decrease of a single pH unit corresponds to ten folds increase in acidic nature.
The expression for pH is as follows.
pH = - ㏒₁₀[H⁺]
Substituting the value of H⁺ in the given expression
pH = - ㏒₁₀[7.2×10⁻⁴]
= - [log[7.2]+log[10⁻⁴]]
= -[(0.8573)+(-4.0)]
= -(-3.1427)
= 3.14
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