Talk:Potassium sulfide

Contradiction?

The way I read it, this sentence seems to contradict itself:

In the laboratory, this synthesis is usually conducted in a solution of anhydrous ammonia.

'solution' means that a solute is dissolved in water, unless is it specified that the solvent is not water.

'anhydrous' means that the substance contains no water.

Could someone please clarify whether the ammonia is solved in water or not?

Nirmos (talk) 01:57, 19 February 2010 (UTC)

Seems like ammonia is the solvent here. As in, potassium is dissolved in ammonia. --Rifleman 82 (talk) 07:14, 19 February 2010 (UTC)

Permanganate + Sulfur

The reaction 2 KMnO₄ + S → K₂S + 2 MnO₂ + 2 O₂ seems to be most commonly used for pyrotechnics. Its value as a preparative technique for even technical grade K₂S requires citation. There's going to be K₂O and SO₂ byproducts, at minimum; I don't know how much, though. --Eh9 (talk) 03:47, 13 April 2012 (UTC)

'THEY' need to state whether the chemical is powder or liquid!

ERROR

"the small K+ ions" - K+ ions are extremely large among the whole ions known.Eudialytos (talk) 20:02, 7 April 2020 (UTC)

You are incorrect. K atoms are relatively large, but K⁺ ions are smaller (196 vs 152). S2- ions have a radius of 170. units = picometers. See Ionic radius.--Smokefoot (talk) 00:03, 8 April 2020 (UTC)