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Whatman number their filters according to the type of material e.g. glass fibre, paper, wet strengthened, hardened, ashless paper and also the porosity e.g. 6 micron, 2.5 - 5 micron. These are also related qualitatively to speed, e.g. fast, medium. So 54 is fast speed (because it's larger pore size) and hardened paper. In this case, 41 is a fast (20 micron) ...


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At very great dilutions, impurities could have some effect on the end point. For example, even previously-distilled water will absorb some small amount of $\ce{CO2}$ from air, making it slightly more acid. However, if the aspirin is present in reasonable amount, that would have negligible effect. So, as stated by @MaxW, consistency, with a moderate ...


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There are different types of mass spectrometers with different modes of sample introduction, analyte ionization and ion selection/focusing. You cannot generalize "with a mass spec." In many cases of isotope ratio mass spectrometry (IRMS), compound specific isotopic analysis (CSIA), or Gas Chromatography Combustion Isotope Ratio Mass Spectrometry ...


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Given its heat resistance to thermal decomposition and the high chemical inertness of soapstone, as noted in this source, for example, to quote: Soapstone is chemically inert, resistant to heat and durable, yet also malleable...As a metamorphic rock, it is very resistant to heat. In fact, soapstone is often used for casting metals, such as lead, pewter and ...


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Maybe your electrode is incorrectly calibrated. But it may be another effect : you should know that at high acidic concentration, the pH values is not obtained by taking the logarithm of the concentration of $\ce{H3O+}$. At high acidic concentration, the concentration should be replaced by the activity, which could be rather different from the concentration. ...


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Take 10 mL of your solution. Add an equal volume of NaOH 1 M. Heat to 100°C and test if the gas has the odor of ammonia. Or check if the gas has a basic reaction by introducing a small and wet indicator paper in the gas getting out of the hot solution (without teaching the glass container). If yes, it means that there is some ammonium salt in the solution. ...


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