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I wish I knew what a pH calibration buffer solution is!
And well you should, if you work with pH. You must know this detail if you want to get anywhere in the pH world.
When we talk about buffer solutions, we usually mean liquids which don’t vary much in pH value when you add acids or bases to them. To achieve this stability, a buffer solution itself must have a balanced mix of acid and base. This graphic will show you how to produce a buffer solution.
Now a pH calibration buffer solution must have an accuracy of +/-0.01 at 25 degrees Celsius. Usually, buffer solutions range in pH from 1.68 to 10.1. They must also follow ISO standards and NIST traceability policy.
Last but not least, buffer solutions can have different colors to identify their pH values. Blue indicates a basic solution, red acidic, and yellow neutral. Hope you learned something today!