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standardize NaCl solution


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Can anybody tell me what primary standard is usually used to standardize NaCl?

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Whether silver ntirate is a primary standard or not is debated somewhat. I think it can be a primary standard, provided a really high grade sample is used. In the paper, I have given here, the silver nitrate must be standardized. You could do the other way around, standardizing your NaCl.

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A primary standard


A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.


A primary standard is a reagent that is extremely pure, stable, has no waters of hydration, and has a high molecular weight.


Some primary standards for titration of acids:

sodium carbonate: Na2CO3, mol wt. = 105.99 g/mol

tris-(hydroxymethyl)aminomethane (TRIS or THAM): (CH2OH)3CNH2, mol wt. = 121.14 g/mol

This is what you were looking for :

Some primary standards for titration of bases:

potassium hydrogen phthalate (KHP): KHC8H4O4, mol wt. = 204.23 g/mol

potassium hydrogen iodate: KH(IO3)2, mol wt. = 389.92 g/mol


Some primary standards for redox titrations:

potassium dichromate: K2Cr2O7, mol wt. = 294.19 g/mol

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Because NaOH and KOH both absorb water from the air in their 'pure' form, and solutions of the bases absorb CO2 from the air to form the bicarbonates. Since the composition of your starting compound changes as soon as you open the bottle, it cannot be used as a standard.

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