Page:The British pharmacopœia.djvu/526

492 {|
 * colspan=3 |British weights and measures.
 * or
 * colspan=3 |Metric weights and measures.
 * colspan=3 |$$\overbrace{\qquad\qquad\qquad\qquad}$$
 * colspan=3 |$$\overbrace{\qquad\qquad\qquad\qquad}$$
 * Grains weight of substance
 * Grain measures of Vol. Sol.
 * or
 * Grams. wt. of Substance
 * C. C. of Vol. Sol.
 * Acid. Arseniosum
 * 4.0
 * 808
 * or
 * 0.40
 * 80.80
 * Sulphurosum
 * 64.0
 * 1000
 * or
 * 6.40
 * 100.00
 * Liquor Arsenicalis
 * 442.0
 * 875
 * or
 * 44.20
 * 87.50
 * Arsenici Hydrochloricus
 * 442.0
 * 875
 * or
 * 44.20
 * 87.50
 * Sodii Hyposulphis
 * 24.8
 * 1000
 * or
 * 2.48
 * 100.
 * }
 * 875
 * or
 * 44.20
 * 87.50
 * Arsenici Hydrochloricus
 * 442.0
 * 875
 * or
 * 44.20
 * 87.50
 * Sodii Hyposulphis
 * 24.8
 * 1000
 * or
 * 2.48
 * 100.
 * }
 * 24.8
 * 1000
 * or
 * 2.48
 * 100.
 * }
 * 100.
 * }

VOLUMETRIC SOLUTION OF NITRATE OF SILVER.

(Nitrate of Silver, AgNO3 = 170.)

Take of

Put the nitrate of silver into the 10,000 grain flask, and, having half filled 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. 1,000 grain-measures of this solution contain $1⁄10$th of a molecular weight in grains of nitrate of silver (or 17.0 grains).

Grammes and cubic centimetres may be employed instead of grains and grain-measures, but for convenience $1⁄10$th of the numbers should be taken. 100 cubic centimetres contain $1⁄100$th of a molecular weight in grammes of nitrate of silver (or 1.7 gramme).

It is used in testing the following substances:—