An introduction to practical chemistry : including analysis . Sollys Gas Rose*s Spirit Lamp. 218 EXAMPLES OP Calculation of Results. 652. When the weight of a precipitate has beenascertained, it is necessary to calculate that of the con-stituent whose weight we wish to learn, and this isreadily done according to the well-known laws of com-bination in definite proportion.* For example, let us suppose that we have to deter-mine the percentage of sulphuric acid (S03) in dry sul-phate of soda (]STaO,S03): we dissolve twenty grains ofthe salt in water, precipitate the sulphuric acid bymea
An introduction to practical chemistry : including analysis . Sollys Gas Rose*s Spirit Lamp. 218 EXAMPLES OP Calculation of Results. 652. When the weight of a precipitate has beenascertained, it is necessary to calculate that of the con-stituent whose weight we wish to learn, and this isreadily done according to the well-known laws of com-bination in definite proportion.* For example, let us suppose that we have to deter-mine the percentage of sulphuric acid (S03) in dry sul-phate of soda (]STaO,S03): we dissolve twenty grains ofthe salt in water, precipitate the sulphuric acid bymeans of chloride of barium (403), and weigh the sul-phate of baryta thus obtained: from this we have todeduce the weight of the sulphuric acid which it con-tains ; and lastly, to calculate from this the percentageequivalent to it. We find the weight of the sulphateof baryta obtained to be 32-50. Knowing the atomicweight of sulphate of baryta (BaO,S03) to be 117, andthat of sulphuric acid (S03) to be 40, it is easy to cal-culate how much of the acid is contained in 32*50 grainsof
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectchemistry, bookyear18
