The addition of a small amount highly basic aqueous ammonia to a soil will cause the ammonium to displace hydrogen ions from the colloids, and the end product is water and colloidally fixed ammonium, but no permanent change overall in soil pH.
22.
I can't answer all your question but I can tell you than ammonia solution ( also known as ammonium hydroxide or aqueous ammonia ) will help to dissolve Fe0, MnO . It's ability to dissolve these compounds depends on forming ammine complexes of the metal ion.
23.
In this test, an aldehyde is treated with Tollens'reagent, which is prepared by adding a drop of sodium hydroxide solution into silver nitrate solution to give a precipitate of silver ( I ) oxide, and then adding just enough dilute ammonia solution to redissolve the precipitate in aqueous ammonia to produce [ Ag ( NH 3 ) 2 ] + complex.
24.
For example, silver chloride dissolves readily in excess aqueous ammonia to form [ Ag ( NH 3 ) 2 ] +; silver salts are dissolved in photography due to the formation of the thiosulfate complex [ Ag ( S 2 O 3 ) 2 ] 3 "; and cyanide extraction for silver ( and gold ) works by the formation of the complex [ Ag ( CN ) 2 ] ".
