Table of Contents
Where analytical balance is used?
Analytical balances usually include draught proof weighing chambers for precise measuring of mass and are often used alongside anti-vibration tables to increase accuracy. A precision balance on the other hand typically measures to the nearest 0.1-0.01g but has higher capacity.
What is the least count of analytical balance?
Majority of times you will find an electronic analytical balance suitable for weighing your samples and reference standards. The readability or least count of such balance is 0.1mg or 0.0001gm.
Who was one of the first to use an analytical balance?
Simple balances were used as early as 5000 B.C. So long is their history that the very word “balance” comes from the Latin word bilanx which means “two pans.” The modern analytical balance originated during the mid-18th century, when the Scottish chemist Joseph Black developed the technique of using a lightweight.
What are the common errors of analytical balance?
Analytical balance errors can arise when the instrument records an inaccurate weight of samples owing to internal and external influences unknown to the operator or because of poor weighing practices. While errors that are induced externally may be a result of numerous factors, they can be eliminated or reduced easily.
How do you avoid analytical balance weighing errors?
Place analytical balances in a protected environment away from temperature extremes such as direct sunlight, heating and AC vents. Avoid heavy traffic that causes vibrations in the weighing area. Avoid overloading, which could cause hysteresis of mechanical parts.
What is least count of a balance?
The smallest value that can be measured by the measuring instrument is called its least count. Measured values are good only up to this value. The least count error is the error associated with the resolution of the instrument. A metre ruler may have graduations at 1 mm division scale spacing or interval.
What is a Class A balance?
Class A Prescription Balance— A balance that meets the tests for this type of balance has a sensitivity requirement of 6 mg or less with no load and with a load of 10 g on each pan. The Class A balance should be used for all the weighing operations required in prescription compounding.
What is the importance of an analytical balance?
Analytical balances are highly sensitive lab instruments designed to accurately measure mass. Their readability has a range between 0.1mg – 0.01mg. Analytical balances have a draft shield or weighing chamber to prevent the very small samples from being affected by air currents.