How to calculate theoretical pH?
Understand the Problem
The question is asking for the method or formula to calculate the theoretical pH of a solution. This typically involves understanding the concentration of acids and bases present in the solution and applying the appropriate formulas to determine the pH value.
Answer
Use Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]).
The final answer is to use the Henderson-Hasselbalch equation to calculate theoretical pH.
Answer for screen readers
The final answer is to use the Henderson-Hasselbalch equation to calculate theoretical pH.
More Information
The Henderson-Hasselbalch equation is specifically useful for buffer solutions composed of a weak acid and its conjugate base, or a weak base and its conjugate acid.
Tips
A common mistake is using the formula for strong acids/bases rather than buffers. Ensure you identify the type of solution first.
Sources
- Determining and Calculating pH - Chemistry LibreTexts - chem.libretexts.org
- How To Calculate the PH of a Buffer Solution | Equation & Example - study.com
- How do I find the theoretical pH of a buffer solution after HCl and ... - chemistry.stackexchange.com
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