4.649)28.140(6.053
27.894
———————
......
If the solid is soluble in water, or has a tendency to float, some liquid other than water is used. Paraffin oil or oil of turpentine will do. The process is as follows:—The weight of the dry and empty bottle having been determined, add a sufficiency of the substance and weigh again to find how much has been added. Fill up with paraffin oil and weigh again. Clean out the substance by rinsing with paraffin; fill up and weigh. Calculate the sp. g. as if water had been used, and multiply by the sp. g. of the paraffin.
For example:
| 1. | Weight | of | bottle | 39.299 | grams |
| 2. | " | " | bottle and nitre | 57.830 | " |
| 3. | " | " | bottle and paraffin | 73.146 | " |
| 4. | " | " | bottle and paraffin and nitre | 84.665 | " |
| 5. | " | " | bottle and water | 81.884 | " |
First from (1),(3), and (5), calculate the sp. g. of the paraffin as already shown. It will be 0.7948. Deduct (1) from (2) to get the weight of the nitre:
57.830 grams
39.299 "
——————
18.531 "
add this to (3):
18.531 grams
73.146 "
——————
91.677 "
and deduct (4) to find the weight of the equal bulk of paraffin.
91.677 grams
84.665 "
——————
7.012 "