TOTAL HARDNESS INDICATOR TABLETS

1. Fill a water sample of approx. ...
2. Fill a 10 ml water sample into another cuvette.
3. Add 1 Hard check tablet, crush it and after having closed the cuvette mix until everything is dissolved.
4. Wait 5 minutes until the reaction time is over.
5. Switch the Spectro 3 Photometer on with any of the keys.

 tablets are dissolved in 100 ml of the water sample to be tested, which has been buffered at pH 10 with 1 ml of Ammonia/ Ammonium chloride buffer solution, and then titrated with EDTA solution (0,01 M) till the sample turns from red to blue. Total hardness in mg/l = 10×ml of titrant used

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