Question

Use the oxidation number to balance the following ionic equations:

a) http://prntscr.com/1sp201 (acidic)
b) http://prntscr.com/1sp22o (basic)

Answer 1

redox reactions?

Answer 2

Yes

Answer 3

do you know how to balance them, or do you have no idea?

first you have to assign oxidation states to all the atoms

(+2)(+6)(-2) (0) (+4)(-2) (+6)(-2)
\(Pb\;\;\;S\;\;O_4\rightarrow Pb+PbO_2+S\;O_4^{2-}\)

identify what's being oxidized and whats being reduced, write the half-reactions

Reduction: \(Pb^{2+} +2e \rightarrow Pb\)
Oxidation: \(Pb^{2+}\rightarrow Pb^{4+} +2e\)

since nothing else (S or O) changed in oxidation states, i'm ignoring them.

both ,the charges and the atoms, are balanced, so thats done, just add them up.