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BRITISH PHARMACOPŒIA.
| British weights and measures. | Metric weights and measures. | ||||||
| Grains weight of Substance. | = | Grain measures of Vol. Sol. | or | Grams, wt. of Substance. | = | C. C. of Vol. Sol. | |
| Ammonii Carbonas | 52.3 | = | 1000 | or | 5.23 | = | 100.0 |
| Borax | 191.0 | = | 1000 | or | 19.10 | = | 100.0 |
| Liquor Ammoniæ | 85.0 | = | 500 | or | 8.50 | = | 50.0 |
| Liquor„ Ammoniæ„ Fort. | 52.3 | = | 1000 | or | 5.23 | = | 100.0 |
| Liquor„ Calcis | 4375.0 | = | 180 | or | 437.5 | = | 18.0 |
| Liquor„ Calcis„ Sacchar | 460.2 | = | 254 | or | 46.02 | = | 25.4 |
| Liquor„ Plumbi Subacet | 284.5 | = | 500 | or | 28.45 | = | 50.0 |
| Liquor„ Potassæ | 462.9 | = | 482 | or | 46.29 | = | 48.2 |
| Liquor„ Potassæ„ Efferves | 4375.0 | = | 180 | or | 437.5 | = | 18.0 |
| Liquor„ Sodæ | 458.0 | = | 470 | or | 45.80 | = | 47.0 |
| Liquor„ Sodæ„ Efferves. | 4375.0 | = | 150 | or | 437.50 | = | 15.0 |
| Plumbi Acetas | 38.0 | = | 200 | or | 3.80 | = | 20.0 |
| Potassa Caustica | 56.0 | = | 900 | or | 5.60 | = | 90.0 |
| Potassii Bicarbonas | 50.0 | = | 500 | or | 5.00 | = | 500 |
| Potassii„ Carbonæ | 83.0 | = | 980 | or | 8.30 | = | 96.0 |
| Potassii„ Citras | 102.0 | = | 1000 | or | 10.20 | = | 100.0 |
| Potassii„ Tartras | 122.0 | = | 990 | or | 12.2 | = | 99.0 |
| Potassii„ Trtra„ Acida | 204.0 | = | 1000 | or | 20.40 | = | 100.0 |
| Soda Caustica | 40.0 | = | 900 | or | 4.00 | = | 90.0 |
| Soda„ Tartarata | 141.0 | = | 990 | or | 14.1 | = | 99.0 |
| Sodii Bicarbonas | 84.0 | = | 1000 | or | 8.4 | = | 100.0 |
| Sodii„ Carbonas | 143.0 | = | 960 | or | 14.30 | = | 96.0 |
| Sodium | 23.0 | = | 975 | or | 2.30 | = | 97.5 |
VOLUMETRIC SOLUTION OF SODA.
(Hydrate of Sodium, NaHO = 40.)
| Take of | |
| Solution of Soda | a sufficiency |
| Distilled Water | a sufficiency |
Fill a burette with the solution of soda, and cautiously drop this into 1,000 grain-measures of the volumetric solution of oxalic acid until the acid is exactly neutralised as indicated by litmus. Note the number of grain-measures of the solution of soda used, and having then introduced 9,000 grain-measures of it into a graduated jar, augment this quantity by the addition of water, until it becomes grain-measures. If, for example, n=930, the 9,000 grain-measures should be augmented to grain-measures. 1,000 grain-measures of this solution contain one molecular weight in
