Multiple Choice
Which of the following is the correctly balanced equation for the reaction between phosphoric acid (H3PO4) and strontium hydroxide (Sr(OH)2)?
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3. Chemical Reactions
Balancing Chemical Equations
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Which of the following is the correctly balanced equation for the reaction: Na2CO3(aq) + NiCl2(aq) -> NaCl(aq) + NiCO3(s)?
A
Na2CO3(aq) + NiCl2(aq) -> 2 NaCl(aq) + NiCO3(s)
B
Na2CO3(aq) + 2 NiCl2(aq) -> 2 NaCl(aq) + NiCO3(s)
C
2 Na2CO3(aq) + NiCl2(aq) -> 2 NaCl(aq) + 2 NiCO3(s)
D
Na2CO3(aq) + NiCl2(aq) -> NaCl(aq) + NiCO3(s)
Verified step by step guidance1
Identify the reactants and products in the given chemical equation: Reactants are Na2CO3(aq) and NiCl2(aq), and products are NaCl(aq) and NiCO3(s).
Write the unbalanced chemical equation: Na2CO3(aq) + NiCl2(aq) -> NaCl(aq) + NiCO3(s).
Count the number of atoms of each element on both sides of the equation. For example, count Na, C, O, Ni, and Cl atoms in the reactants and products.
Balance the equation by adjusting coefficients to ensure the same number of each type of atom appears on both sides. Start by balancing elements that appear in only one reactant and one product, such as Ni and C.
Check your balanced equation to ensure that the number of atoms for each element is equal on both sides. The balanced equation should be: Na2CO3(aq) + NiCl2(aq) -> 2 NaCl(aq) + NiCO3(s).
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