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Magnesium sulfate is a soluble solid which is formed when insoluble magnesium oxide reacts with dilute sulfuric acid.
Which method is used to prepare solid magnesium sulfate?

1 ) 

Excess sulfuric acid is reacted with magnesium oxide. The mixture is evaporated to dryness.

2 ) 

Excess sulfuric acid is reacted with magnesium oxide. The precipitate is filtered, washed and dried.

3 ) 

Sulfuric acid is reacted with excess magnesium oxide. The mixture is filtered and the filtrate is evaporated to dryness.

4 ) 

Sulfuric acid is reacted with excess magnesium oxide. The precipitate is filtered, washed and dried.

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