Proper Use of Balances - Chemistry LibreTexts
Aug 17, 2022 · The tried-and-true method of transferring a precisely weighed sample uses "weighing by difference," shown here. The empty balance is tared, then the weighing bottle with cap is placed on the pan and weighed to ±0.0001 g. The weighing bottle is removed in a manner which avoids the transference of oil or other matter from one's fingers.
Mass Determination - Chemistry LibreTexts
Aug 20, 2019 · If you wish to weigh an object directly, press down gently on the bar again to get a reading of zero (be patient, sometimes you will have to wait until the balance does not feel vibrations). Place the object on the pan, and record the reading in your lab notebook.
Measuring Mass - Harper College
Direct weighing means that an object is placed directly on a balance and the mass read. Weighing directly requires that the balance be carefully zeroed (reads zero with nothing on the balance pan) in order to obtain accurate results.
Weighing compounds using a balance | Resource | RSC Education
This resource is part of the interactive lab primer collection. Weighing is done to ensure the correct amount of a reactant is added to a reaction, for the preparation of standard solutions or the weighing of a product to calculate a yield.
1.7: Measuring Mass, Length, and Volume - Chemistry LibreTexts
The Difference Between Mass and Weight The mass of a body is a measure of its inertial property or how much matter it contains. The weight of a body is a measure of the force exerted on it by gravity or the force needed to support it.
Measuring Mass - Examples - Harper College
Measuring Mass - Examples. 1.50 grams of copper sulfate is needed to prepare a solution. Using a balance that reads to the hundredths place (2 decimals), this could be done as follows: Direct Weighing - while this works, remember, we never weigh chemicals directly on the balance pan. Weighing by Difference - Method 1.
Weighing Techniques - Wired Chemist
Weighing Techniques. With nothing on the pan, set to zero by pressing the "on" button. Place weighing bottle, beaker, or vial on balance and set to zero again. Use a clean scoopula to transfer sample into container slowly, until you reach the desired mass.
When weighing a chemical, a container should be used; never pour the chemical directly onto the balance pan. Options include (from left to right) weighing boat/dish (several sizes available), beaker and other glassware, or weighing paper. In addition, should you not need the mass of your container, you can press the tare/zero
INTRODUCTION. A thorough knowledge and care of the balances used in the laboratory is essential. Many weighings are rough and require the top-loading balance. However, semimicro quantities must be weighed using an analytical balance. IMPORTANT RULES FOR WEIGHING: Do not handle objects to be weighed with bare hands.
This first laboratory experiment will demonstrate the measurement of mass and volume using different types of equipment, demonstrate the difference between precision and accuracy, and use these skills to determine and calculate the density of an unknown substance.