Table 2. Chemical analysis of potassium pentaborate tetrahydrate, KB5O8·4H2O.
Gram molecular weight = 293.214 g
| Percentage
|
||||
|---|---|---|---|---|
| PCBCa | Theoretical | This work
|
||
| Observed | Normalized | |||
|
|
|
|
|
|
| K2O | 16.21 | 16.06 | 16.07 | 16.09 |
| B2O3 | 59.31 | 59.37 | 59.18 | 59.25 |
| H2O | ………… | 24.57 | 24.63 | 24.66 |
| Na2O | none | |||
| Cl | 0.008 | |||
| SO3 | .0002 | |||
| SiO2 | .0038 | |||
| Al2O3 | .0051 | |||
| F2O3 | .0003 | |||
| CaO | .0012 | |||
| MgO Less than— | .0005 | |||
| As2O3 | .0007 | |||
| P2O5 | .0009 | |||
| Pb | .0050 | |||
| Mn Less than— | .00001 | |||
| K2O:B2O3 Ratio | 1:4.95 | 1:5 | 4:4.98 | |
|
|
|
|
||
| Total of K2O, B2O3, and H2O | 99.88 | 100.00 | ||
a
Pacific Coast Borax Company.