Multiple Choice
When aluminum carbonate (Al2(CO3)3) is reacted with hydrochloric acid (HCl), what is the balanced chemical equation for the reaction?
3. Chemical Reactions
Balancing Chemical Equations
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Which of the following is the balanced chemical equation for the reaction between aqueous barium chloride and aqueous sodium phosphate to form solid barium phosphate and aqueous sodium chloride?
A
BaCl2(aq) + Na3PO4(aq) → Ba3(PO4)2(s) + NaCl(aq)
B
3BaCl2(aq) + 2Na3PO4(aq) → Ba3(PO4)2(s) + 6NaCl(aq)
C
3BaCl2(aq) + Na3PO4(aq) → Ba3(PO4)2(s) + 3NaCl(aq)
D
2BaCl2(aq) + 3Na3PO4(aq) → 2Ba3(PO4)2(s) + 6NaCl(aq)
Verified step by step guidance1
Identify the reactants and products in the chemical equation: Barium chloride (BaCl₂) and sodium phosphate (Na₃PO₄) are the reactants, while barium phosphate (Ba₃(PO₄)₂) and sodium chloride (NaCl) are the products.
Write the unbalanced chemical equation: BaCl₂(aq) + Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + NaCl(aq).
Balance the barium atoms: Since there are 3 barium atoms in Ba₃(PO₄)₂, you need 3 BaCl₂ molecules. Update the equation to 3BaCl₂(aq) + Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + NaCl(aq).
Balance the phosphate ions: There are 2 phosphate ions in Ba₃(PO₄)₂, so you need 2 Na₃PO₄ molecules. Update the equation to 3BaCl₂(aq) + 2Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + NaCl(aq).
Balance the sodium and chloride ions: There are 6 sodium ions and 6 chloride ions needed to balance the equation, so you need 6 NaCl molecules. The balanced equation is 3BaCl₂(aq) + 2Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6NaCl(aq).
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