We are being asked to balance the given half-reaction and indicate if it is and oxidation or reduction.
When balancing redox reactions in acidic media use the following steps:
Step 1. Balance the non-hydrogen and non-oxygen elements first
Step 2. Balance oxygen by adding H2O to the side that needs oxygen (1 O: 1 H2O)
Step 3. Balance hydrogen by adding H+ to the side that needs hydrogen (1 H: 1 H+)
Step 4. Balance the charges: add electrons to the more positive side (or less negative side)
Complete and balance the following half-reactions. In each case indicate whether the half-reaction is an oxidation or a reduction.
TiO2(s) → Ti2+(aq) (acidic solution)
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