1.6 - 1.6 Applications Balancing Chemical Equations...

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1.6 Applications Balancing Chemical Equations: · substances are consumed – reactants · substances are produced – products · # of atoms of elements are preserved EX: Alka-Seltzer contains – sodium bicarbonate NaHCO 3 – citric acid H 3 C 6 H 5 O 7 When dissolved in water, it produces · sodium citrate Na 3 C 6 H 5 O 7 · water H 2 O and · carbon dioxide gas CO 2 so the unbalanced equation is NaHCO 3 + H 3 C 6 H 5 O 7 Na 3 C 6 H 5 O 7 + H 2 O + CO 2 Balance the chemical eqn, i.e., Fnd x 1 , x 2 , x 3 , x 4 , x 5 so that x 1 NaHCO 3 + x 2 H 3 C 6 H 5 O 7 x 3 Na 3 C 6 H 5 O 7 + x 4 H 2 O + x 5 CO 2 Solution: ±irst , list all types of atoms comprising the 1
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reactants and products · Na sodium · H hydrogen · C carbon · O oxygen Second , for each reactant and product form a vector showing how many of each type of atom are in each molecule NaHCO 3 1 1 1 3 sodium hydrogen carbon oxygen H 3 C 6 H 5 O 7 0 8 6 7 Na 3 C 6 H 5 O 7 3 5 6 7 2
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H 2 O 0 2 0 1 CO 2 0 0 1 2 Third
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1.6 - 1.6 Applications Balancing Chemical Equations...

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