Holds

Usage examples of contains.

The small quantity of white flocculent precipitate which may be observed in the acetic acid solution before titrating, contains the whole of the iron as ferric arsenate.

The wide-mouthed bottle contains either a short test-tube or an ordinary phial with its neck cut off.

Steel must not be used, since it is not pure, and contains a variable amount of iron.

It can be obtained very pure, but always contains more or less silver, 1 or 2 milligrams in 100 grams.

It always contains some silver, the amount of which must be determined.

Calculate the percentage of sulphur it contains, for use in the preceding question.

Silver is found in the ores of other metals, such as fahlerz, which sometimes contains from two to ten per cent.

If the ore contains practically no quartz, the soda may be altogether omitted, and some glass or powdered quartz added.

Red lead, however, contains an excess of oxygen which will use up some of the reducing agent before lead separates out.

The value of any particular parcel of ore is that of the quantity of fine copper it contains, calculated on this standard, minus the returning charges.

Any coloured residue which may be left is generally organic matter: it is filtered off, calcined, and any copper it contains is estimated colorimetrically.

If the oxygen comes off but no copper is deposited, it is because the assay solution contains too much nitric acid.

The residue contains the lead as sulphate, together with the insoluble matter of the ore and globules of sulphur.

The residue contains the antimony as antimonate of soda, and is dissolved off the filter with hot dilute hydrochloric, with the help of a little tartaric, acid.

The precipitate contains the zinc, which can be dissolved out by boiling with dilute sulphuric acid, and detected by the formation of a white precipitate on the addition of potassic ferrocyanide.