[spec] finalise complex numbers section

diff --git a/chem/redox.md b/chem/redox.md
index 8928f9ebcf72b2f6fcde42c0c1b816db3daad78f..2e0c80a3bb3eaba9e3990dd9e6739e61b7186a74 100644 (file)
--- a/chem/redox.md
+++ b/chem/redox.md
@@ -10,3 +10,9 @@ Simultaneous process
 
 Mg(s) -> Mg^2+(s) + 2e- (half equation)  
 O2(g) +4e- -> 2O2-(s) (half equation)
+
+Solving simultaneous redox equations
+
+2mg(s) -> 2Mg2+(s) + 4e-  
+2mg(s) + O2(g) -> 2Mg(2+)(s) + 2O(2-)(s)  
+-> 2MgO(s)
\ No newline at end of file