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how can i identify distilled water?

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danavuia.1987:
If i make total alkalinity ( 100 ml water , 2-3 drops of metylorange and HCl 0.1 N titration, ) and the result*2.8=temporary hardness (the hardness that dissapears on boiling) .
This valus shold be very small?
Or it should be 0?

chenbeier:
Distilled water will not have any calcium. A titration with HCl will get with 1 drop a indicator change.

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