| British Weights and Measures. | or | Metrical Weights and Measures. | |||||
| Grains weight of substance. | = | Grain-measures of vol. sol. | Grams weight of substance. | = | C. C. of vol. sol. | ||
| Acid. arsenios | 4·0 | = | 808 | or | 0·40 | = | 80·8 |
| Acid. sulphurosum | 34·7 | = | 1000 | ” | 3·47 | = | 100·0 |
| Liquor arsenicalis | 441·5 | = | 808 | ” | 44·15 | = | 80·8 |
| Liquor arsenici hydrochloricus | 441·5 | = | 810 | ” | 44·15 | = | 81·0 |
Volumetric Solution of Nitrate of Silver (nitrate of silver, AgO, NO5 = 170, or AgNO3* = 170).
| Take of nitrate of silver | 170 grains. |
| Distilled water | a sufficiency. |
Put the nitrate of silver into the 10,000 grain flask, and having filled half the flask with water, allow the salt to dissolve; then dilute the solution with more water until it has the exact bulk of 10,000 grain-measures.
The solution should be kept in an opaque stoppered bottle. 1000 grain-measures of this solution contain 1⁄10th of an equivalent in grains of nitrate of silver (or 1·70 grains). Grammes and cubic centimètres may be employed instead of grains and grain-measures, but for convenience 1⁄10th of the numbers should be taken. 100 cubic centimètres contain 1⁄10th of an equivalent in grammes of nitrate of silver (or 1·7 grammes).
It is used in testing the following substances.
| British Weights and Measures. | or | Metrical Weights and Measures. | |||||
| Grains weight of substance. | = | Grain-measures of vol. sol. | Grams weight of substance. | = | C. C. of vol. sol. | ||
| Acid. hydrocyan. | 270 | = | 1000 | or | 27·0 | = | 100·0 |
| Potass. bromid. | 10 | = | 840 | ” | 1·0 | = | 84·0 |
| Sodæ arsenias (dry) | 10 | = | 1613 | ” | 1·0 | = | 161·3 |
Volumetric Solution of Oxalic Acid (crystallised oxalic acid, 2HO, C4H6 + 4HO = 126, or H2C2O42H2O = 126). Take of—
| Purified oxalic acid in crystals, quite dry, but not effloresced | 630 grains. |
| Distilled water | a sufficiency. |
Put the oxalic acid into the 10,000 grain flask, fill the flask to about two thirds of its bulk with water, allow the acid to dissolve, and then dilute the solution with more water until it has the exact volume of 10,000 grain-measures. 1000 grain-measures of this solution contain half an equivalent in grains (63 gr.) of oxalic acid, and are therefore capable of neutralising an equivalent in grains of an alkali or alkaline carbonate. Grammes and cubic centimètres may be employed instead of grains and grain-measures, but for convenience 1⁄10th of the numbers should be taken. 100 cubic centimètres contain 1⁄20th of an equivalent in grammes (6·3 grammes) of oxalic acid, and will neutralise 1⁄10th of an equivalent in grammes of an alkali. The following substances are tested with this solution: