[After | ivericd x | ie calcu- | K average x calculated cen 
lo. | lated by us | with K=0.060 K = 0.0695 
Zish beth Alle eer iv | | 10 | 12.2 
TN 0.076 | RR sf 
a0. Ven ds. 020 64 | “eee 
| 45 73 [o.oo] 0.065 = 73 | 76 
Gee vol vake 0.076 eer: | 80.5 
15 84 0.00 | 5 Ten 
90 | 8 0.064 hha. | 86 | 
300 | 100 ns 94 SE 
Now we have come to a diseussion of his results on the influence 
of an excess of acid on the diazotisation of aniline. 
TassiLy couples 10 c.c. of the diazonium solution, the acidity of 
which has been mentioned above, with 10 ec. of the ScHAFFER’s 
salt solution (containing 3 gr. of ScHArrer’s salt and 3 gr. of NaOH 
per liter). As a second experiment he couples 10 c.c. of a diazonium 
solution containing much more acid, with 10 c.c. of the same solution 
of ScHArrer’s salt. Now this diazonium solution contains per liter: 
100 ec. of the amine solution used, makes 0.21 gr. HCI 
moreover  #00''e.& 5 °/- HCl... Sier 
Total 5.21 gr. HCI 
The solution of ScHärrer’s salt contains 3 gr. NaOH per L., which 
ze = 2.74 gr. HCl. 
So the excess of HCl amounts to 2.47 gr. and consequently the 
coupling takes place in a solution, containing 1.235 gr. HCl per 
Liter; the diazotisation therefore can continue and the quantity of 
inverted amine will be found greater than was in fact diazotised at 
the moment the sample was drawn. From this we conclude that 
his experiments in regard to the influences of an excess of HCI on 
that rate of the diazotisation of aniline cannot be exact. 
As to his experiments on the influence of the concentrations of 
nitrite and amine together, as well as of each apart, on the course 
of the diazotisation of sulphanilic acid, we must call attention to 
the fact that Tassitiy tries to diazotise sulphanilic acid with sodium 
nitrite without the presence of HCI and that without a catalyser. 
He thinks he studies a quantitative diazotisation in doing this. As we 
therefore can neutralise 
