1896 | TOXIC ACTION OF DISSOLVED SALTS 105 
34. SILVER NITRATE (AgNO,) 5/5 gm. mol. per liter, 1occ. 
POTASSIUM CYANIDE (KCN) +... #0 7 4". aa gGe. 
(Concentrations based on Ag present.) 
(Begun April 14, 5 P.M.) 
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sird0v pat Ae 25.0 ue living 
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Tos 100 24.0 “ 36.5 “ . 
Se cigieal a 23.5 “ 27.0 “ “ 
200800 st." 46.0 “ - 
ee 37.65): 30.0" dead 
zove00 21.0.% 66.07% living 
When silver nitrate in solution is treated with potassium 
cyanide solution, a precipitate of silver cyanide is formed, which 
upon further addition of potassium cyanide redissolves. The 
solution of silver cyanide in cyanide of potassium is due to the 
formation of potassium silver cyanide, KAgCN,, which in aque- 
ous solutions dissociates into the ions K+ and AgCN;. The 
latter are very stable, and we should naturally expect from the 
theory that they have a different toxic action from the Ag ions. 
his is confirmed by experiment. The results are given in tables 
33 and 34 which show that the ions AgCN; are far less poison- 
ous than silver ions.” 
A few other inorganic acids will now be considered, the 
action of which is not quite as readily explained as that of the 
acids mentioned in tables 1 to 4. Hydrocyanic acid is practic- 
ally not dissociated in aqueous solutions, for its electrical con- 
ductivity is almost nil, The toxic action of this acid must be 
due, then, to the undissociated HCN present in the solution. 
Table 35 shows that the lupines will bear zg4y9 8™- mol. per 
liter of this acid, 
20 . : 
Compare iron and the potassium ferro- and ferricyanides as given above. 
