Which glassware is more precise




















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We have interdisciplinary activities and tips to help. This brief guide will provide you with the information you need to make a number of solutions commonly used in educational laboratories.

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Home » Interdisciplinary » Accuracy of Glassware. Many science classes begin with an overview of equipment. Students memorize the names of laboratory glassware and their functions but rarely determine accuracy or relate glassware accuracy to function. In this activity, students employ density calculations to establish the accuracy of several common pieces of laboratory glassware and make a claim relating the accuracy of a piece of glassware to its designated purpose.

Accuracy is defined as how close a measurement is to the true or standard value. Students compare accuracy values for different pieces of glassware using percent error calculations and use percent error as evidence for justifying a claim relating glassware accuracy to use. Students may have seen wet or liquid and dry measuring cups in the kitchen and wondered if a wet cup is equal in volume to a dry cup.

This quick demonstration is an easy segue into the concept of laboratory glassware accuracy. Obtain dry and liquid kitchen measuring cups. The volume of the dry cup does not matter. Fill the dry cup with water, and then pour the water into the liquid measuring cup.

Ask students to observe. Repeat the demonstration with a dry substance—flour, sugar, rice, and small beans are good examples. Ask students to make a claim about the accuracy of the measuring cups. Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a newsolution to better meet the criteria for success. Remind students to be mindful of where they place glassware.

Have a broom, dust pan, and a container for broken glassware available. Generally, measurements with class A volumetric glassware can be considered reliable to two places after the decimal point. Graduated cylinders, beakers and Erlenmeyer flasks have less accuracy than volumetric glassware. Graduated cylinders can generally be considered reliable to within 1 percent. Beakers and Erlenmeyer flasks should not be used to measure volume unless you need only a very crude estimate because their accuracy for volume measurements is so poor.

They can hold a much larger volume than any of the other types of glassware, however, which makes them useful for mixing solutions.

In general, beakers and Erlenmeyer flasks should be used to mix and transport chemicals during an experiment or to store waste.

You can measure volumes with graduated cylinders if only limited accuracy is necessary; for greater accuracy, use a pipet or a buret. Burets are best for titration. If you need to prepare a solution of known concentration, always use a pipet and a volumetric flask--these items both have very low tolerance, so you can be more confident that the concentration of your solution is close to your calculated value.

When recording data, remember to record uncertainties and to use the appropriate number of significant figures given the kind of glassware you used to take each measurement. Based in San Diego, John Brennan has been writing about science and the environment since Laboratory Glassware and Functions. The Names of Chemistry Flasks. Based on accuracy, assign each piece of glassware appropriate uses and state evidence for your choice.

If you need to measure other volumes besides those on volumetric flasks, then the graduated cylinder is the best tool. The beaker is pretty accurate, and you can easily stir and heat chemicals in it. I would not use a flask to measure volume given the large percent error. Precision: how close two or more measurements are to each other. Accurate glassware : volumetric pipe Precise glassware : volumetric pipet2 Each piece of glassware typically will be labeled either TC to contain or TD to deliver.

Using the TD notion, the liquid will be accurate when transferred, however when using the TC notion, the liquid will not be accurate when delivered to another container. For each task, select either the volumetric flask, beaker, pipe, or graduate cylinder and explain why it would be the best choice.

One would predict that the 10 ml graduated cylinder would be the one because the graduations are more finite and of greater resolution.

Archive "Always start out with a larger pot than what you think you need. What Glassware Is Most Precise. Contents 1. Calculations 2. Laboratory 3.



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