exp12 - AIM The aim of this exercise is to master the use...

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AIM The aim of this exercise is to master the use of an analytical balance and show accurate pipetting skills. Also, the concentration of an unknown acidic solution will be calculated with the correct use of a burette in an acid-base titration. INTRODUCTION Uncertainty, also known as margin of error, of a measurement is stated by giving a range of values which are most likely to contain the true value. The uncertainty of a measurement is usually found by repeating the measurement enough times to get a good estimate. If the values are averaged, then this measurement value has a much smaller uncertainty. A volumetric pipette is made of glass, and calibrated for a single volume only. The pipette is filled by dipping the tip in solution, and drawing up the liquid with a pipette filler past the inscribed mark. The volume is then set accurately to the inscribed mark by releasing the vacuum using the pipette filler. A burette is a vertical cylinder of glass with a precision tap at the bottom. The tap is used to control the rate of flow of a liquid, and a volumetric graduation on the side is used to record the volume expelled. The bottom of the meniscus of the liquid should be touching the top of the line you wish to measure from. The burette is mainly used to determine the
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exp12 - AIM The aim of this exercise is to master the use...

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