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    $\begingroup$ My guess is that NaHP is hygroscopic, but KHP, which is a primary standard, is not hygroscopic. This is helpful when it comes time to weigh out the standard. A quick search shows 5 suppliers of NaHP, none of which I have ever heard of previously. $\endgroup$
    – Ed V
    Commented Oct 1, 2020 at 23:37