Social Media Management intermediate
Select ALL statements that describe a buffer correctly.
Answer
It resists changes in pH when acid or alkali is added, It commonly contains a weak acid and its conjugate base, It is most effective when acid and salt concentrations are equal
Explanation
A buffer resists pH changes and commonly combines a weak acid with its conjugate base, often supplied as a salt. Buffering is strongest when their concentrations are equal, since the Henderson–Hasselbalch ratio is then 1 and pH equals pKa. **Key takeaway:** Effective buffers contain a conjugate pair. **Glossary:** Buffer capacity: resistance to pH change.
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