Experiment 2 CALIBRATION OF A PIPETTE Introduction An ordinary laboratory pipette may be expected to deliver its nominal volume with good precision and good accuracy if it is used in the way recommended. In this experiment we investigate the precision and accuracy of such a pipette by making accurate determinations of the mass of water it delivers in repeated operations. Materials 10.0-cm3 pipette‚ 50-cm3 beaker‚ thermometer‚ pipette filler‚ graph paper. Procedure
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But she’s adopted S- *goes to the corner and cries* *Dart Scene* C- y’all ready for a family game night? SA- I suppose it will help release tension‚ Heather you’re up for it C- It will help you with your precision and accuracy because you suck so bad (Explains precision and accuracy) *heather throws all three darts and misses* SA- Well you’re accurate at sucking but at least you’re precise
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weight of these products so you can properly conduct experiments and make clear observations. Different techniques will be used to determine these densities and one in particular is mixing the liquids in different proportions to compare the accuracy and precision of your calculated densities to the initial in text values. The reactions being used in this experiment are the liquids and solids. The following is a brief chronological listing of the procedures to follow while conducting the experiment
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survive. Accuracy and Precision relate to quality of measurement. Accuracy refers to how close the measurements are to the “true” value or accepted standard value or known value. Precision is how close measurements are to each other. Precision is a unit of measurement that is also referred to as the ability to reproduce the same results multiple times. Society is reliant on standard measurements when they buy goods and services. Society depends upon the accuracy and precision of measurements
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than those we actually measured. We need to round our answer off to reflect the same level of certainty in our answer as we had with the measures we made. Accurate or Precise? Precision refers to how close data are to each other Are the consistent with each other? Significant Figures indicate confidence/precision Accuracy refers to how close data are to an accepted value Error-difference between data point and accepted value % error-as part of accepted value International System of Units (SI) Base
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uncertainty gives the reader an idea of the precision and accuracy of your measurements. Use the following method for finding the uncertainty associated with any measuring device used in lab. First‚ find the least count‚ or the smallest printed increment‚ of the measuring device. On the meter sticks‚ the least count is 1 mm. On the double pan balances‚ the least count is 0.1 g. On the small graduated cylinders‚ the least count is 25 ml. If you are using the full precision of the instrument‚ you are probably
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ability to ’tare’ when taking the mass of your sample? Be specific. Answer: Tare is used to reset a balance to zero in order to get only the weight of a sample‚ not of a sample and container (Yee‚ n.d.‚ Weighing…). It is important because accuracy and precision are both very important when measuring. The tare feature makes the measurement more accurate. It also allows just the substance to be measured without the substance having to be put directly on the balance. (c) (2 pts) What is the difference
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0.03 g/cm^3. The results for this experiment prove that as you increase % of NaCL‚ the density increases also because of the weight of NaCL is increased. Graph #1 shows that as the %NaCL increased so did the density‚ therefore proving the accuracy and precision of part II calculations. In part III‚ of the experiment‚ the density of regular shaped objects‚ were calculated based on volume measured method and water displacement method. My hypothesis for this part of the experiment was that volume measured
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in presence of a base to yield phenylthiourea derivative. This derivative showed maximum absorbance at 240 nm. Beer’s law is obeyed in the concentration range of 5-25 µg/ml. The method was validated in terms of linearity‚ precision (relative standard deviation 1.1%)‚ accuracy and specificity. The proposed method is the only method available for spectrophotometric determination of the drug. It is simple‚ precise‚ accurate‚ sensitive and reproducible and can be used for the routine quality control
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the US should continue their use of drones in warfare. The use of drones in warfare should continue to be used by the US because they have multiple advantages. One of the reasons why drones are a huge benefit for the US is because of their precision and accuracy. An article that is in favor of the US continuing their use of drones in warfare states‚ “... since the United States began conducting drone strikes abroad following the Sep. 11‚ 2001 attacks‚
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