Answer
0.1% in 50% ethanol gives a clear solution; use 2–3 drops per titration.
Detailed question
How is the solution prepared?
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Try "boiler water treatment", "tank cleaner" or a chemical name such as "citric acid".
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0.1% in 50% ethanol gives a clear solution; use 2–3 drops per titration.
How is the solution prepared?