Question

Match the formula for the following compound: 

magnesium sulfate heptahydrate

MgS·7H2O

Mg2SO4·7H2O

Mg(SO4)2·7H2O

MgSO4·7H2O


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Answer 1

valence of magnesium is 2

and valence of sulfate-ion is 2 too

answer: MgSO4•7H2O

Answer 2

Answer:
`MgSO_4.7H_2O`

Step-by-step explanation:

`MgSO_4` is an ionic compound because aluminium element is a metal and hydrogen element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.

The nomenclature of ionic compounds is given by:

1. Positive is written first.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written in case of
`SO_4^(2-)` is '-ate'.

Hence, the name of
`MgSO_4` is magnesium sulphate.

The water of crystallization is written as hydrate with the number of water molecules. As the name is heptahydrate, that means 7 water molecules are present.

Therefore, the correct answer is
`MgSO_4.7H_2O`