Homework Help: Chemistry

Posted by Jessica on Wednesday, December 10, 2008 at 9:51pm.

Describe how you can show that a chemical reaction adhers to the law of conservation of mass. Chemical reaction: magnesium hydroxide added to phosphoric acid produces magnesium phosphate and water. Find the mass percentage of each compound as well as the total mass of reactants compared to the total mass of products

Chemistry - DrBob222, Wednesday, December 10, 2008 at 10:27pm
Write the equation and balance it.
3Mg(OH)2 + 2H3PO4 ==>Mg3(PO4)2 + 6H2O

Start with a convenient amount of Mg(OH)2 and H3PO4. I would suggest 3 mol Mg(OH)2 and 2 mols H3PO4. With stoichiometry, determine mols of the salt produced and mols H2O produced. Now describe how you would go about experimentally showing that the mass of the products is th same as the mass of the reactants.

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