What is the ideal sample temperature for testing hardness?

Document ID

Document ID TE298

Version

Version 3.0

Status

Status Published

Published Date

Published Date 08/07/2018
Question
What is the ideal sample temperature for testing hardness?
Summary
Ideal sample temperature for hardness testing
Answer
Samples below 21 °C should be titrated slowly near the endpoint because color development is slower. Samples previously boiled have their calcium bicarbonate hardness removed (precipitated), which lowers its Total Hardness as compared to a non-boiled sample. For Methods 8030 and 8374 best accuracy results require the sample temperature between 21-29 °C (70-84 °F).

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