What is the ideal sample temperature for testing hardness?
Ideal sample temperature for hardness testing
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).