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Answer :
To find the pOH of a solution when given the hydroxide ion concentration [tex]\([OH^-] = 2.0 \times 10^{-2}\)[/tex], follow these steps:
1. Understand the Formula for pOH:
The pOH of a solution is calculated using the formula:
[tex]\[
\text{pOH} = -\log[OH^-]
\][/tex]
where [tex]\([OH^-]\)[/tex] is the concentration of hydroxide ions in the solution.
2. Plug in the Given Number:
Substitute the given concentration into the formula:
[tex]\[
\text{pOH} = -\log(2.0 \times 10^{-2})
\][/tex]
3. Calculate the pOH:
Use a calculator to compute the logarithm:
[tex]\[
\text{pOH} \approx -\log(0.02) \approx 1.70
\][/tex]
4. Select the Correct Answer:
Among the given choices, the one that matches our calculation is:
- D. 1.70
Therefore, the pOH of the solution is approximately 1.70.
1. Understand the Formula for pOH:
The pOH of a solution is calculated using the formula:
[tex]\[
\text{pOH} = -\log[OH^-]
\][/tex]
where [tex]\([OH^-]\)[/tex] is the concentration of hydroxide ions in the solution.
2. Plug in the Given Number:
Substitute the given concentration into the formula:
[tex]\[
\text{pOH} = -\log(2.0 \times 10^{-2})
\][/tex]
3. Calculate the pOH:
Use a calculator to compute the logarithm:
[tex]\[
\text{pOH} \approx -\log(0.02) \approx 1.70
\][/tex]
4. Select the Correct Answer:
Among the given choices, the one that matches our calculation is:
- D. 1.70
Therefore, the pOH of the solution is approximately 1.70.
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