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Medicine & Drugs: Whether this drug is more effective than another in relation to a 0.1 mol quantity?

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Q: State and explain whether 0.1 mol magnesium hydroxide is more effective or less effective than 0.1 mol of aluminum hydroxide.

I don't know how I would solve this question? Is it related to molar mass, bonds, polarity? I have no clue...

Please help me understand how I can solve this question.

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For every 0.1 mol of the compound, there are 0.3 mol of hydroxide in Al(OH)3, and 0.2 mol of hydroxide in Mg(OH)2. Both are assumed to completely dissociate. From what I am given aluminum hydroxide would be effective when hydroxide is "effective". 

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