During a search for magnesium sulfate hydrates, Kim Chemist obtained TWO Registry numbers for the formula, H2 O4 S . 7 H2 O . Mg. The Registry numbers were 14457-55-7 and 10034-99-8. Offer a reason why this is so.
There are two possible reasons for a chemical to have multiple numbers.
The CAS numbers could refer to different forms of a chemical where each is considered unique for its particular properties and characteristics.
A chemical may also be listed with multiple CAS numbers when multiple numbers have been inadvertently assigned to the same chemical. This multiple assignment can occur when forms of a chemical are originally believed to be unique, but after further review by chemists, are identified as the same chemical. In this case, all the CAS numbers are cross referenced, allowing the chemical to be located with any assigned number. The misassigned numbers are deleted as registry numbers, but remain on file for referencing purposes.
in our case
magnesium sulphate can exist in 2 diddferent forms as
MgSO4 and, CAS NO 10034-99-8
MgSO4 . 7H2O , CAS NO 14457-55-7
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