Question

The pH of a solution is measured as 8.3. What is the hydrogen ionconcentration of the solution?A. 2.0 x 10^-8 MB. 8.3 MC. 5.0 x 10-9 MD. 8.0 x 10-3 M

Answer 1

Step 1

pH is defined as:

$\begin{gathered} pH\text{ = -log }\lbrack H+\rbrack \\ \lbrack H+\rbrack\text{ = concentration of hydrogen ion or proton} \\ \lbrack H+\rbrack=10^{-pH} \end{gathered}$

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Step 2

pH = 8.3 =>

$\lbrack H+\rbrack=10^{-8.3}=5.0x10^{-9}M$

Answer: C.

$\lbrack H+\rbrack=5.0x10^{-9}M$