Self life of volumetric solution

Quality Control
1

Any procedure available for how to determine self of volumetric solutions like 0.5N NaOH, HCl etc.?

2

After standardisation of solution do the analysis daily and note down the normality for one month to 45 days . The normality of solution should not vary 2%. if it decrease or increase after 35 days give shelf life of 30days.

Make 3 trials or 3 repeats

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3

thanks