12.549 g.

23.104 g

27.042 g.

When a student removed the crucible cover?

when a student removed the crucible cover afer the first strong heating in creating magnesium oxide, some of the white was knocked from the cover to the floor and was lost. did this loss cause the calculated number of moles of oxygen in the compound to be too high or too low? Too low but you can figure that yourself.

Why is it important for the crucible lid to be offset?

To get a good result, be sure to keep the lid on the crucible while cooling to prevent moisturefrom the atmosphere interacting with the anhydrous salt, especially if the lab is humid. This willcause the mass of water (and therefore the percent of water) to be too low. Hot crucible look like cold crucibles.

Why must the lid of the crucible be off while heating?

Ignite the Bunsen burner and heat the one of the crucibles for about 5 minutes to remove water from the crucible. While heating the crucible, you must have the lid partially ajar to allow water to escape.

What are the basic principles of gravimetric analysis?

The principle of Gravimetric Analysis: The principle behind the gravimetric analysis is that the mass of an ion in a pure compound and can be determined. Later, used to find the mass percent of the same ion in a known quantity of an impure compound.

What is meant by doing a gravimetric analysis?

Gravimetric analysis, a method of quantitative chemical analysis in which the constituent sought is converted into a substance (of known composition) that can be separated from the sample and weighed.

How equivalent weights of precipitating agents is determined?

For cations, equivalent weight is the atomic weight divided by the valency of atom. Equivalent weight in Precipitation Reactions: Equivalent weight of a salt in a precipitation reaction is the gram molecular weight of the salt divided by the valency of the reacting ions.

How much is the mass of BaSO4 formed?

Properties of Barium Sulfate – BaSO4

BaSO4 Barium Sulfate
Molecular Weight/ Molar Mass 233.38 g/mol
Density 4.5 g/cm³
Boiling Point 1,600 °C
Melting Point 1,580 °C