ve c.c. of
strong hydrochloric acid are added, and the contents of the tube boiled
gently for a few seconds until the sulphide is dissolved and all the
H_{2}S driven off or decomposed: 2-3 c.c. of a saturated solution of
tartaric acid are added, and the contents of the tube washed into a 250
c.c. Erlenmeyer flask. The solution is then nearly neutralised with sodium
carbonate, excess of bi-carbonate added, and after the addition of some
starch solution titrated with N/20 iodine solution. This method for small
quantities of stibnite is both quick and accurate, the error being about
+-0.0003 grm. Sb_{2}S_{3} at the outside.

The tendency of this method is to give slightly low figures for the
fulminate, but since these are uniform within a negligible error, it does
not affect the value of the results as a criterion of uniformity. The
following test results were obtained by Dr Brownsdon:--

____________________________________________________________
| | | |
| Fulminate Taken. | Fulminate Found. | Error. |
| Grm. | Grm. | Grm. |
| | | |
| 0.0086 | 0.0083 | -0.0003 |
| 0.0082 | 0.0081 | -0.0001 |
| 0.0074 | 0.0071 | -0.0003 |
| 0.0068 | 0.0066 | -0.0002 |
|____________________|___________________|___________________|
| | | |
| Stibnite Taken. |Sb_{2}S_{3}, Found.| Error. |
| Grm. | Grm. | Grm. |
| | | |
| 0.0085 | 0.0084 | -0.0001 |
| 0.0098 | 0.0099 | +0.0001 |
| 0.0160 | 0.0157 | -0.0003 |
| 0.0099 | 0.0100 | +0.0001 |
|____________________|___________________|___________________|

TABLE FOR CORRECTION OF VOLUMES OF GASES FOR TEMPERATURE, GIVING THE
DIVISOR FOR THE FORMULA.

V_{1} = V x B/(760 x (1 + dt)) (d = 0.003665) 1 + dt from 0 deg. to 30 deg. C.

___________________________________________________________
| | | | |
t. | 760x(1+dt). | t. | 760x(1+dt). | t. | 760x(1+dt).
_____|_____________