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Camphorated Acetic Acid

Pulverize 1 ounce camphor in 1 fluid drachm rectified spirit, and dissolve in 10 fluid ounces strong acetic acid. This is fragrant and refreshing, and used as an embrocation in rheumatism and neuralgia, and as a fumigation in fever, &c. 3896. To Obtain Strong Acetic Acid from Vinegar. Expose the vinegar to the action of a freezing mixture, or place in the 3891. To Obtain Pure Glacial or air in very cold weather; the water separates Hydrated Acetic Acid. Place 30 parts and becomes ice, and the strong acid remaindry and finely powdered pure acetate of soda ing fluid may be drained from it. (See No. in a capacious retort, and pour on it 97 parts pure sulphuric acid. The heat developed by the action of the ingredients will cause one- 1749.) 3897. Mohr's Table of the Specific eighth of the acetic acid to pass over. The Gravity of Acetic Acid at Various retort may then be placed in a sand bath until strengths. The following table, drawn up the contents become quite liquid. The product, carefully rectified, yields 2 parts of pure acid containing only 20 per cent. of water.

By exposing the latter portion, which comes of Glacial Sp. Gr. over in a closed vessel, to a temperature below 40° Fahr., crystals of hydrated (glacial) acetic acid will be deposited. The liquid portion being then poured off, the crystals are again melted and re-crystallized by cooling. These last crystals, separated from the liquid, are perfectly pure. 3892. To Obtain Glacial or Hydrated Acetic Acid Without Distillation. The acid may also be obtained without resorting to distillation, thus: Place 100 parts powdered acetate of soda (pure commercial) in a hardglazed stoneware or glass pan; pour 35 or 36 parts concentrated sulphuric acid gradually into the pan, so that the acid may flow under the powder, and as little heat as possible be generated by the operation. In furtherance of this necessary end, the process is best conducted in a cool apartment, and the pan kept well cooled. The whole must now be covered and allowed to stand for some hours, when crystalline grains of sulphate of soda will be found covering the inside of the vessel, and hydrated acetic acid, partly liquid and partly in crystals, in the upper portion. The temperature must then be raised just sufficiently to liquefy the crystals of acetic acid, the fluid poured off, and a very small quantity of pure acetate of lime added gradually, until it yields no trace of sulphuric acid on evaporation. After repose it may be decanted for use. 3893. Το Obtain Pure Acetic Acid.

Triturate together 10 parts crystallized neutral acetate of lead, and 3 parts effloresced (dry) sulphate of soda; mix together 2½ parts each by M. Mohr, exhibits the specific gravity of acetic acid of almost every strength.

Per cent.

Per cent.

Per cent.

Acid.

Acid.

Acid. 100 1.0635 67 1.069 34 1.045 99 1.0635 66 1.069 33 1.044 98 1.067 65 1.068 32 1.0424 97 1.0680 64 1.068 31 1.041 96 1.069 63 1.068 30 1.040 95 1.070 62 1.067 29 1.09 94

1.0706 61 1.067 28 1.038 93

1.0708 60 1.067 27 1.036 92

1.0716 59 1.066 26 1.035 91

1.0721 58 1.066 25 1.034 90

1.0730 57 1.065 24 1.033 89

1.0730 56 1.064 23 1.032 88 1.0730 55 1.064 22 1.031 87

1.0730 54 1.063 21 1.029 86

1.0730 53 1.063 20 1 027 85

1.0730 52 1.062 19 1.026 84

1.0730 51 1.061 18 1.025 83

1.0730 50 1.060 17 1.024 82

1.0730 49 1.059 16 1.023 81

1.0732 48 1.058 15 1.022 80

1.0735 47 1.056 14 1.020 79

1.0732 46 1.055 13 1.018 78

1.0732 45 1.055 12 1.017 77 1.073 44 1.054 11 1.016 76 1.072 43 1.053 10 1.015 75 1.072 42 1.052 9 1.013 74 1.072 41 1.0515 8 1.012 73 1.071 40 1.0513 7 1.010.