Table 1.
Stability of mint silver at 25° C in 20 percent aqueous solutions of perchloric acid
| Timea | True mass in a vacuum | Total change in mass | Rate of change in mass | |
|---|---|---|---|---|
|
| ||||
| Hours | Grams | μg | μg/hour | (μg/hr)/cm2 |
| 0 | 14.139731 | …………………… | …………………… | …………………… |
| 25.5 | 14.139662 | −69 | 2.7 | 0.045 |
| 72.0 | 14.139531 | −200 | 2.8 | .047 |
| 125.5 | 14.139444 | −287 | 2.3 | .038 |
| 241.5 | 14.139363 | −368 | 1.5 | .025 |
| 387.0 | 14.139268 | −463 | 1.2 | .020 |
| 504.0 | 14.139248 | −483 | 0.96 | .016 |
| 895.0 | 14.139151 | −580 | .65 | .011 |
| 898.0 | 14.139172 | −559 | .62 | .010 |
a
Time of immersion of silver in the solution.