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Homework answers / question archive / The following lab purpose is to determine how the number of unpairs electrons effect the strength of the paramagnetism of metal salts
The following lab purpose is to determine how the number of unpairs electrons effect the strength of the paramagnetism of metal salts.
A sensitive electronic balance is used to measure the attraction between a group of powerful neodymium magnets and a test tube containing 3.00 g of a metal salt. The balance is zeroed before the test tube is lowered to just above, but not touching, the magnets.The mass reading shown on the balance is then recorded. Several ionic compounds containing different metal ions were individually tested one at a time using the same test tube and using the same mass of each compound. If the magnets are pulled upward against gravity, off the balance, a negative reading will appear on the balance.
Question at the end of the lab, determine which statements do you think is right?
1. Both Ba 2* and Cd 2* had close mass decrease values because they had almost the same molar Mass. So all compounds used should have the same_molar mass to give better results. 2.The results would be more accurate if the compound was in a beaker instead of a test tube.
3.There is no need for the wooden block on the balance and it should be removed. 4.The data would be more accurate if all the compounds contained the same anion.
5. Each compound should be placed in a new clean test tube to prevent contamination.
6.The data would be more accurate if more than 5.00 g of compound was used. 7.The specific distance the test tube should be lowered to needs to be identified in the procedure.
8.The test tube should be sealed to prevent the chemical absorbing moisture from the air.
