# What is the half reaction for TiO2(s) –> Ti2+(aq)?

In acidic solution: Complete and balance the above half-reaction. In each case indicate whether the half-reaction is an oxidation or a reduction. Thank you!

Ti O2(s) —-> Ti2+(aq)
+4 -4 ———>+1 , since Ti went from +4 to +1 (the electrons became more negative), this is a reduction.

Step1: Balance everything except for hydrogen and oxygen. It is already balanced.

Ti (s) ——-> Ti2+(aq)

Step 2: Balance the Oxygen in the equation by adding a H2O molecular for each O atom, we have 2 in this equation.

TiO2(s) —–> Ti2+(aq) + 2H2O(l)

Step 3: Balance the Hydrogen by adding hydrogen ion, H+ to the appropriate side.

TiO2(s) + 4H(g) ——> Ti2+(aq) + 2H2O(l)

Step 4: Balance charge by adding electrons, e-, to the appropriate side. Since, Ti when from +4 to a +1, there is a difference of 3, so we add 3e- on the reaction side of the equation.

TiO2(s) + 4H(g) + 3e- ——> Ti2+(aq) + 2H2O(l), this is your answer.

Hope this helped,
Bill

Also Read :   Cos2x=____. Check all the apply?

Source(s): q

You’re right, There’s +4 from hydrogen on the left side and 2+ on the right side from Ti. so you only need 2 electrons

but how tio2 forms oxigen vacancies ? and how used for resistive switching?? if any method to create oxigen vacancies without anneling or temp application? ty n advance