Sodium chloride reaction with lead nitrate

The unsoluble fluorophosphates can be prepared from the sodium salt by reaction with heavy metal nitrates, whereas the watersoluble salts are appropriately prepared by the reaction of the sligthly soluble AgjPOjF with heavy metal chlorides (24). Acid salts M H[P03F] with = Na, K, NH4 result from fractional precipitation by addition of alcohol and ether to the aqueous solution of the free acid (17). Further methods for the synthesis of fluorophosphates are given by Eqs. (12) and (13), which lead to dimethylin fluorophosphate (32) and to tin (II) difluorophosphate (55) ... 

The harsh conditions needed to introduce five or more nitro groups into diphenyl ether lead to the destruction of the aromatic ring. Highly nitrated derivatives of diphenyl ether can be prepared by an indirect route 2,2, 4,4, 6-pentanitrodiphenyl ether (92) is the product from the controlled nitration of (91), which is obtained from the reaction of picryl chloride (87) with sodium o-nitrophenolate. ... 

The test is usually carried out by adding the reagent to the solution acidified with dilute hydrochloric acid carbonates, sulphites, and phosphates are not precipitated under these conditions. Concentrated hydrochloric acid or concentrated nitric acid should not be used, as a precipitate of barium chloride or of barium nitrate may form these dissolve, however, upon dilution with water. The barium sulphate precipitate may be filtered from the hot solution and fused on charcoal with sodium carbonate, when sodium sulphide will be formed. The latter may be extracted with water, and the extract filtered into a freshly prepared solution of sodium nitroprusside, when a transient, purple colouration is obtained (see under Sulphides, Section IV.6, reaction 5). An alternative method is to add a few drops of very dilute hydrochloric acid to the fused mass, and to cover the latter with lead acetate paper a black stain of lead sulphide is produced on the paper. The so-called Hepar reaction, which is less sensitive than the above two tests, consists of placing the fusion product on a silver coin and moistening with a little water a brownish-black stain of silver sulphide results. 

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