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Jul 14, 2021 at 4:06 comment added Poutnik Controlling of bubbling melted carbonate ( m.p < 900 Deg C) seems more difficult than checking/precipitating of residual calcium by extra carbonate. Glowing foam could easily cause fire.
Jul 13, 2021 at 22:01 history edited DrMoishe Pippik CC BY-SA 4.0
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Jul 13, 2021 at 21:49 comment added DrMoishe Pippik @Poutnik, "a great deal of energy" was stated. Perhaps a pottery kiln? Decomposition temp ~1200 °C, which can be reached in a kiln. Amending answer for that.Admittedly, not easy to do.
Jul 13, 2021 at 10:15 comment added Poutnik I am curious, how would you easily convert K2CO3 to KOH by heating at home , assuming you cannot afford even KOH shipping. The medieval way M2CO3 + Ca(OH)2(from bricklayers) -> CaCO3 + 2 MOH seems to be much easier.
Jul 12, 2021 at 19:34 history edited DrMoishe Pippik CC BY-SA 4.0
Added onversion and safety note
Jul 12, 2021 at 12:58 comment added alephzero Potassium bicarbonate is used in agriculture as a fungicide, and as a soil conditioner to control acidity. It is also used in dry powder fire extinguishers, and as an alternative to sodium bicarbonate (baking soda) in cooking by people on a low-sodium diet. Depending how pure you need it, you should be able to find a source for it somewhere.
Jul 12, 2021 at 7:33 comment added Poutnik @Jaredbrandt K2CO3 is often available as well.// Just for curiosity - it is largely used in Dutch processing of cocoa ( cocoa gets from light brown to dark brown by the process ) to produce chocolate from inferior cocoa beans, enhancing cocoa flavour and removing acidity.
Jul 12, 2021 at 4:40 comment added Jared Brandt What other potassium salts are generally available??
Jul 12, 2021 at 3:56 history answered DrMoishe Pippik CC BY-SA 4.0