why in aluminium sulphate equation sulphur is in bracket?

Asked by Yashoda patil | 21st Dec, 2013, 04:26: PM

Expert Answer:

The cation is written first: aluminum ion (Al3+)

The anion is written after that: sulfate ion (SO42-)

Since the charges are not equal in magnitude, the charge on the aluminum ion (+3) becomes the subscript for the sulfate ion. The charge on the sulfate ion (-2) becomes the subscript for the aluminum ion.

The formula of aluminium sulphate is Al2(SO4)3. The brackets are placed around the sulphate ion to indicate that three sulphate ions are present. If the brackets are not placed around the sulphate SO4, the formula will become SO43 which is completely incorrect.

Answered by Hanisha Vyas | 22nd Dec, 2013, 05:09: PM

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