Question

Write the formula of the compound formed by the ions al3+ and so4-2

Answer 1

I Think that (Al)+3(SO4)-2 =(Al)2(SO4)3

Answer 2

The formula of the compound formed by the ions $Al^{3+}$ and $SO_4^{2-}$ is $Al_2(SO_4)_3$.

Explanation:

• From the ions given it is inferred that the compound whose formula must be identified is an ionic compound.
• To write the formula of an ionic compound, the charge of the ions involved in the reaction must be taken into consideration.
• If both ions are balanced, simply the symbol of the ion must be written to obtain the formula of the compound.
• On the other hands, if the ions are unbalanced, the charge of the ions must be cross multiplied to balance it.
• As in the given case, the charge of Al is 3, whereas of $SO_4$ is 2, it must be cross multiplied and it gives the formula as $Al_2(SO_4)_3$.

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A metal M forms an ionic compound X of formula M2(So4)3 ( 2 and 3 subscript)

a) write the cation formula in the X .

b)what is the formula of nitrate of metal' M' ?

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Explain the formation of anions and cations in ionic compound through example symbols (formulae)

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