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