Ovations On Other Sites - Ovation 02 Ovations 06Formidable Ace chose the topics covered by Ovations On Other Sites - Ovation 02 without reflecting upon the choices others have made. Explaining where you are going when you really have no idea just so that people who care about you do not worry and wonder about your fate is another way to look at things in a different light. |
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Sometimes it is necessary to draw up a table which will show, without calculation, the weight of substance equivalent to a given volume of gas or of solution. The substance used for standardising should be, whenever possible, a pure sample of the substance to be determined--that is, for copper assays pure copper should be used, for iron assays pure iron, and so on; but when this cannot be got an impure substance may be used, provided it contains a known percentage of the metal, and that the impurities present are not such as will interfere with the accuracy of the assay. Including compounds with these, the standard may be calculated by multiplying the standard got in the usual way, by the percentage of metal in the compound or impure substance, and dividing by 100. If, for example, the standard 1.008 gram was obtained by using a sample of iron containing 99.7 per cent. of metal, the corrected standard would be 1.008×99.7/100 = 1.005. In volumetric analysis the change brought about must be one in which the end of the reaction is rendered prominent either by a change of colour or by the presence or absence of a precipitate. If the end of the reaction or finishing-point is not of itself visible, then it must be rendered visible by the use of a third reagent called an indicator. |
By 8.30 in the morning of December 5th we entered the mouth of the Madeira River. I was surprised at the sudden change in the appearance of the two rivers. We saw in the Madeira high, gently sloping banks, covered with verdant grass and neat trees and palms along the top of them; whereas along the Amazon the trees stood almost in the water on the recently formed islands and banks. The left bank of the Madeira was of grey and reddish clay (grey below, red above), cut vertically, sometimes actually in steps. Blocks of a rectangular shape, in getting dried up, split and fell over, leaving the banks vertical. The right bank, on the contrary, was gently sloping, descending with a beautiful carpet of green grass into the stream. The islands were charming, with lovely lawns all round. Blackish and deep red rock, vertical and fluted, and with innumerable perforations, could be seen here and there, covered over with a padding of earth from ten to twenty feet deep. |
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