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Sodium Bicarbonate (Naco3), Max, % 0.5. Matter Insoluble In Water, Max % 0.25. ... The bulb of a thermometer, 0º to 360°C, shall be immersed in this sample and the test tube shall be supported over the Wood’s metal bath so that the top of the sample is just below the level of the Wood’s metal. Heat shall be applied to the metal bath at ... ................
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