## Chemistry: The Central Science (13th Edition)

Published by Prentice Hall

# Chapter 20 - Electrochemistry - Exercises - Page 901: 20.23b

#### Answer

$4H^{+} (aq) + TiO_{2}(s) + 2e^{-} → Ti^{2+} (aq) + 2H_{2}O$ This is a reduction reaction

#### Work Step by Step

We add water on the right hand side and H on the left hand side to balance the equation. Since Titanium is releasing two electrons and going from oxidation state of 0 to +2, this is a reduction reaction.

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