Calculate Ph for 2.0 10 3 M Sr Oh 2
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Reviewed by Calculator Editorial Team
Determining the pH of a solution containing Sr(OH)₂ (strontium hydroxide) is essential in chemistry and environmental science. This guide explains how to calculate the pH for a 2.0 × 10⁻³ M Sr(OH)₂ solution using our calculator and step-by-step instructions.
How to Calculate pH
The pH of a solution is a measure of its acidity or basicity. For solutions containing strong bases like Sr(OH)₂, we can calculate the pH using the hydroxide ion concentration.
Steps to Calculate pH
- Determine the molar concentration of the hydroxide ions ([OH⁻]).
- Calculate the pOH using the formula: pOH = -log[OH⁻].
- Calculate the pH using the relationship: pH = 14 - pOH.
For strong bases like Sr(OH)₂, the concentration of hydroxide ions is equal to the concentration of the base.
pH Calculation Formula
The pH of a solution can be calculated using the following steps:
1. [OH⁻] = [Sr(OH)₂] = 2.0 × 10⁻³ M
2. pOH = -log[OH⁻] = -log(2.0 × 10⁻³)
3. pH = 14 - pOH
Where:
- [OH⁻] = hydroxide ion concentration (M)
- [Sr(OH)₂] = concentration of strontium hydroxide (M)
- pOH = negative logarithm of the hydroxide ion concentration
- pH = negative logarithm of the hydrogen ion concentration
Worked Example
Let's calculate the pH for a 2.0 × 10⁻³ M Sr(OH)₂ solution:
- First, determine the hydroxide ion concentration: [OH⁻] = 2.0 × 10⁻³ M.
- Calculate pOH: pOH = -log(2.0 × 10⁻³) = -(-3.3010) = 3.3010.
- Calculate pH: pH = 14 - pOH = 14 - 3.3010 = 10.6990.
The pH of the solution is approximately 10.70, indicating it is a basic solution.
Interpreting Results
The pH scale ranges from 0 to 14:
- pH < 7: Acidic solution
- pH = 7: Neutral solution
- pH > 7: Basic solution
A pH of 10.70 indicates a strongly basic solution, which is typical for solutions containing strong bases like Sr(OH)₂.
FAQ
- What is the pH of a 2.0 × 10⁻³ M Sr(OH)₂ solution?
- The pH is approximately 10.70, indicating a strongly basic solution.
- How do I calculate pH from hydroxide concentration?
- Use the formula: pH = 14 - (-log[OH⁻]).
- Is Sr(OH)₂ a strong or weak base?
- Sr(OH)₂ is a strong base, so the hydroxide ion concentration equals the base concentration.
- What does a pH of 10.70 mean?
- A pH of 10.70 indicates a strongly basic solution, which is typical for strong base solutions.