Balancing Chemical Equations Video Lessons

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Concept: Balancing Chemical Reactions

Problem: Consider 5.83g of Mg(OH)2 (s) reacted with 500.ml of 0.100M H 3PO4 .a) Balance the equation for complete neutralization.b) Calculate how many grams of Mg 3(PO4)2 are formed in this reaction.

FREE Expert Solution

For this problem, we're asked to a) Balance the equation for the complete neutralization of Mg(OH)2 with H3POand b) Calculate the mass in g of Mg3(PO4)2 formed in this reaction


We need to do the following steps: 


Step 1: Write balanced chemical equation for the reaction.  


Step 2: Calculate the # of moles for Mg(OH)2 (mass to mole using molar mass) and # of moles for H3PO(using molarity and the given volume)


Step 3: Based on the balanced chemical equationdo a mole-to-mole comparisonto determine the limiting reactant


Recall that the limiting reactant or limiting reagent is the compound that determines the maximum amount of product obtained in a chemical reaction.


The limiting reactant is the one that shows a smaller product yield (or smaller # of moles), while the excess reactant is that one that shows a greater product yield.


Step 4: Calculate the  mass in g (mole to mass using its molar mass) of Mg3(PO4)2 formed from the moles of the limiting reactant 

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Problem Details

Consider 5.83g of Mg(OH)2 (s) reacted with 500.ml of 0.100M H 3PO4 .

a) Balance the equation for complete neutralization.

b) Calculate how many grams of Mg 3(PO4)2 are formed in this reaction.

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