Social Media Management basic
Which expression defines pH in terms of hydrogen ion activity?
Answer
pH = −log10(aH+)
Explanation
The definition in the material is the negative base-10 logarithm of hydrogen ion activity: $pH=-\log_{10}(a_{H^+})$. For sufficiently dilute solutions, activity can be approximated by concentration. **Key takeaway:** pH decreases as hydrogen ion activity increases. **Glossary:** Activity: effective concentration of an ion.
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