Answer Posted / vinay dagar

KF Reagent equivalence Factor always be calculated with water on daily basis which is the write procedure because we know that water we are using is 100% pure.

Now DST used to standardize the instrument functioning, therefore to establish the facts like instruments sensitivity, Electrode response etc. can be established through titrating DST a primary standard. In such a way we can establish the instrument is in correct working conditions.

If there is difference in the value of water content in DST means instrument functioning is doubtful & need proper CAPA.

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