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Some people state, that the salt which we buy at the supermarket contains too much potassium chloride. For me it seems to be a hoax, but I want to have a proof.

Is there any way to measure the percentage of sodium chloride and potassium chloride in salt at home without special equipment?

If it is not possible, what kind of equipment is needed?

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    $\begingroup$ It doesn't make much difference, but it's potassium iodide, which is added. Iodide anion concentration would be much easier to find out. $\endgroup$ – Mithoron Oct 18 '17 at 21:28
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    $\begingroup$ RE: "Some people state..." -- Love it. Reference to vague and unknown authority. $\endgroup$ – MaxW Oct 19 '17 at 1:16
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    $\begingroup$ @Mithoron It could be iodate, not iodide. $\endgroup$ – Ivan Neretin Oct 19 '17 at 4:49
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    $\begingroup$ @GáborLipták - I think you miss the point that I was trying to make. By using "Some people" as the authority it is impossible to backtrack who actually said what. So such a claim could be on the Skeptics forum asking if any recognizable authority has actually stated that "regular salt" has too much potassium. $\endgroup$ – MaxW Oct 19 '17 at 19:35
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    $\begingroup$ Two problems: 1) why worry about the amount of potassium? I isn't harmful. 2) Why not just take what the label says: most authorities insist on ingredient labelling and this should help identify any salt with more than traces of potassium (some high potassium salt is sold as a "low sodium" alternative to normal salt). $\endgroup$ – matt_black Oct 21 '17 at 14:51
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To answer your question: no, you cannot do it at home. Some analytical techniques are mentioned in the comments.

However I decided to post because LIKELY people should not worry about the Potassium content of table salt.

Table salt (normally "just" NaCl) containing as much of 28.5 % of Potassium (might be more perhaps, but this is what I have at hand) can be sold free of medical prescription not only in drugstores/pharmacies but also in supermarkets, where it can be found in the special diets section or alongside standard salt. It is a dietary salt indicated to limit the Sodium intake (for instance in case of high blood pressure). Its price is much higher that that of common salt. It can be used to replace salt in all kitchen uses. It is less salty and more bitter than the normal salt, and one has to "get the mouth" to it.

I would therefore infer that is highly unlikely that something sold as table salt NaCl could contain so much potassium to worry about. Especially when some of those worrying of it, might be prone to buy Potassium integrators during summer :)

Disclaimer: it is clear that the potassium content of whatever table salt sold in food stores and supermarkets should not be matter of concerns however, as for any diets and integrators (Fe, K, Mg...) there exists health conditions which are incompatible. Before starting a diet or taking dietetic salts one should seek the advice of his/her physician. ingredients and content of a hyposodic table salt

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