Chemistry A-Level
pH expression
What pH expression means in Chemistry A-Level, as defined for OCR.
Definition of pH expression
Check what you remember
Read the wording for your board, then hide it and explain pH expression in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
pH = –log[H⁺] and its rearrangement [H⁺] = 10^(–pH) are the two forms used to convert between pH and hydrogen ion concentration.
Topics that use pH expression
- Acids, bases and buffers (OCR A-Level)
Related terms
- Acid dissociation constant Ka
- acidic buffer
- Amphiprotic
- basic buffer
- Basicity
- Buffer action against added acid and alkali
- Buffer action and pH resistance
- Calibration with buffer solutions
Using pH expression in the exam
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