Buffer ratio from pH
A buffer in a environmental chemistry case study has \(pH=7.50\) and \(pK_a=7.20\). Calculate \([A^-]/[HA]\). Enter the answer and choose the interpretation that matches the HL chemistry evidence.
Worked practice: chemistry evidence and answer
Use the chemical evidence first, then enter the result and interpretation that match it.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.