Calculate OH- from pH.
Understand the Problem
The question is asking how to calculate the hydroxide ion concentration (OH-) from a given pH value. To find OH-, we need to use the formula: OH- = 10^(14 - pH). This involves using the relationship between pH and pOH in a neutral solution at 25 °C.
Answer
The hydroxide ion concentration is $1,000,000 \, \text{M}$.
Answer for screen readers
The hydroxide ion concentration is $1,000,000 , \text{M}$.
Steps to Solve
- Identify the given pH value
Assume we have a specific pH value. For example, let's say the pH is 8.
- Substitute the pH value into the formula
The formula for calculating hydroxide ion concentration ($[\text{OH}^-]$) is given by:
$$ [\text{OH}^-] = 10^{14 - \text{pH}} $$
Now, we substitute our pH value into the equation.
- Calculate the exponent
Using the pH value of 8:
$$ [\text{OH}^-] = 10^{14 - 8} $$
This simplifies to:
$$ [\text{OH}^-] = 10^6 $$
- Determine the hydroxide ion concentration
Now calculate the final result, which is:
$$ [\text{OH}^-] = 1,000,000 , \text{M} $$
The hydroxide ion concentration is $1,000,000 , \text{M}$.
More Information
In this example, the pH of 8 indicates a basic solution, resulting in a high concentration of hydroxide ions. Remember, the relationship between pH and hydroxide ion concentration is vital in various fields such as chemistry and biology.
Tips
- Incorrectly calculating the exponent: Make sure to subtract the pH value accurately from 14.
- Misunderstanding the logarithmic function: Recognize that $10^x$ signifies the power of 10 and that higher pH values will produce lower hydroxide ion concentrations.
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