Problem: How many hydroxide ions are in 2.5 mol Mg(OH) 2?

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We have to determine the number of hydroxide (OH-) ions in 2.5 mol Mg(OH)2.

The number of hydroxide ions in Mg(OH)2 can be determined by writing an equation for the dissociation of Mg(OH)2.

Mg is a group 2A metal which loses two electrons to form a cation with a charge of +2.

OH- is a polyatomic ion with a charge of -1.

The equation for dissociation is:

Mg(OH)2(s) → Mg2+(aq) + 2 OH-(aq)

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How many hydroxide ions are in 2.5 mol Mg(OH) 2?

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