Multiple Choice
Which of the following is the correctly balanced chemical equation for the reaction between BaCl2 and MgSO4?
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3. Chemical Reactions
Balancing Chemical Equations
Multiple Choice
Which of the following is the correctly balanced chemical equation for the reaction: h2o2(aq) + clo2(aq) → clo2−(aq) + o2(g)?
A
h2o2(aq) + clo2(aq) → clo2−(aq) + h2o(l) + o2(g)
B
h2o2(aq) + 2 clo2(aq) → 2 clo2−(aq) + 2 h+(aq) + o2(g)
C
2 h2o2(aq) + 2 clo2(aq) → 2 clo2−(aq) + 2 o2(g) + 2 h+(aq)
D
2 h2o2(aq) + clo2(aq) → clo2−(aq) + 2 h2o(l) + o2(g)
Verified step by step guidance1
Identify the oxidation states of elements in the reactants and products to determine which species are oxidized and which are reduced. For example, in H2O2, oxygen is in the -1 oxidation state, and in ClO2 and ClO2⁻, chlorine has different oxidation states.
Write the half-reactions for the oxidation and reduction processes separately. For instance, write the oxidation half-reaction for H2O2 converting to O2, and the reduction half-reaction for ClO2 converting to ClO2⁻.
Balance each half-reaction for all atoms except hydrogen and oxygen first, then balance oxygen atoms by adding H2O, and hydrogen atoms by adding H⁺ ions (since the reaction is in aqueous acidic solution).
Balance the charges in each half-reaction by adding electrons (e⁻) to the appropriate side so that the total charge is the same on both sides of the half-reaction.
Combine the two half-reactions by multiplying them by appropriate coefficients so that the electrons cancel out, then add the half-reactions together. Finally, verify that the number of atoms of each element and the charges are balanced in the overall equation.
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