Table 3. Chemical analysis of sodium pentaborate pentahydrate, NaB5O8·5H2O.
Gram molecular weight = 295.117 g
| Percentage
|
||||
|---|---|---|---|---|
| PCBCa | Theoretical | This work
|
||
| Observed | Normalized | |||
|
|
|
|
|
|
| Na2O | 10.59 | 10.50 | 10.64 | 10.62 |
| B2O3 | 58.64 | 58.98 | 58. 54 | 58. 45 |
| H2O | ………… | 30.52 | 30.98 | 30. 93 |
| Cl | 0.0046 | |||
| SO3 | .0014 | |||
| SiO2 | .0014 | |||
| Al2O3 | .0047 | |||
| Fe2O3 | .0035 | |||
| CaO | .0080 | |||
| MgO | .0005 | |||
| P2O5 | .0041 | |||
| As2O3 | .0001 | |||
| Pb | .0015 | |||
| Mn | .00025 | |||
| Na2O:B2O3 Ratio | 1:4.93 | 1:5 | 1:4.90 | |
|
|
|
|
||
| Total of Na2O, B2O3, and H2O | 100.16 | 100.00 | ||
a
Pacific Coast Borax Company.