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Mg(OH)2 + 2HNO3 -> Mg(NO3)2 + 2H2O

Like that.

Remember, NO3 is 1- and Mg is 2+, so you need 2 NO3 to fo with 1 Mg.

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Q: How do you balance mg oh 2 ADD hno3 -- mg no3 ADD h2o?
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