Question

In: Chemistry

which method, direct weighing or weighing by difference, is used when an accurate mass is to...

which method, direct weighing or weighing by difference, is used when an accurate mass is to be obtained? explain why

Solutions

Expert Solution

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 by difference requires that two measurements be taken. for example a clean piece of weighing paper is placed on the balance and weighed. This is the first reading. The substance to be weighed out is then placed on the weighing paper and weighed. This is the second reading. The mass of the substance is determined by subtracting the first reading from the second.

(mass of paper + substance) - (mass of paper) = (mass of substance)


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