Oxidation number of O=-2. Check to see if the oxidation numbers show oxidation or reduction. Sulfide ion is at -2 oxidation state. Asked by | 25th Mar, 2009, 06:56: PM. what is the oxidation number of pb in pbso4. Sum of all oxidation number =0. Lead, being a metal, has very set oxidation numbers. H in H2 : 0. Could you tell me how you went about getting the oxidation number for Pb in PbSO4? Pb in PbSO4 : +2. Therefore oxidation number of Pb in PbSO 4 â¦ The total should equal when you add all oxidation numbers: Pb + (-2) = 0 ----> Pb = +2. Identify the products and the reactants, and then their oxidation numbers. But Sulfate ion has -2 charge. Pb. Oxidation number of Pb is +2 Figuring out why these numbers are the way they are takes a fair amount of work. Therefore x+6-8=0. pb +2 s-2 + h +1 2 o-1 2 â pb +2 s +6 o-2 4 + h +1 2 o-2 b) Identify and write out all redox couples in reaction. Therefore oxidation number of Pb is +2. +1 +3 0-1 +2 +1. Also, the answer would not be +10 if what you had said was correct (about the sulfur ion). The system is compared with measurements on Pb(Hg) in H 2 SO 4 and with Pb(Hg), Hg, solid Pb in HClO 4 solution. PbSO 4 salt does not have an overall charge. The anodic oxidation of solid Pb in H 2 SO 4 to form PbSO 4 has been investigated by rotating disc, potentiostatic pulse and ac impedance measurements. It is suggested that a precipitation mechanism to form PbSO 4 occurs under some conditions prior to the solid state â¦ Oxidation number of S=+6. SO4 has charge of -2. How to calculate oxidation number of Pb in PbSO4?And Explain? If you consider oxidation as the loss of electrons and gain of oxidation number, and reduction as the gain of electrons and decrease in oxidation number, the oxidation states are as follows: Pb : 0 (Elementary state) H in H2SO4 : +2. ... Pb PbO2 PbSO4 H2O H2SO4. You are correct that oxidation is the loss of electrons and reduction is the gaining of electrons. What is the oxidation number of phosphorous in the H3PO2 molecule? It can only be +2, or +4. So, Pb is at +2 oxidation state. To neutral that -2 charge, +2 charge should be there and it is given by Pb 2+ ion. Identify the substance oxidised, reduced, oxidising agent and reducing agent for each of the following reactions: Pb(s) + PbO 2 (s) + 2H 2 SO 4 (aq) â 2PbSO 4 (s) + 2H 2 O(l) PbSO4 --> Pb2+ + SO4 2- (A net dissociation reaction of the salt) SO4 has an oxidation number of -2. H2O2 + PbS --> PbSO4 + H2O. Identify which reactants are being oxidized (the oxidation number increases when it reacts) and which are being reduced (the oxidation number goes down). In order to make the compound neutral, Pb must be +2. I went by the rule of the most electronegative atom getting their typical oxidation state (so O was assigned -2 (total -8)...then S was assigned -2...and finally Pb was given +10 to balance the molecule). Oxidation = number goes down Reduction = number goes up. 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