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. Oxidation number of O=-2. Figuring out why these numbers are the way they are takes a fair amount of work. It can only be +2, or +4. 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 of S=+6. 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. SO4 has charge of -2. Check to see if the oxidation numbers show oxidation or reduction. Therefore x+6-8=0. 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. Asked by | 25th Mar, 2009, 06:56: PM. PbSO 4 salt does not have an overall charge. But Sulfate ion has -2 charge. H in H2 : 0. Oxidation = number goes down Reduction = number goes up. PbSO4 --> Pb2+ + SO4 2- (A net dissociation reaction of the salt) SO4 has an oxidation number of -2. The rates of PbSO4 formation on the Pb–0.08 mass% Ca–Sn alloys, which are the choice materials for grids in the valve-regulated lead–acid battery (VRLA), were inhibited by the presence of Sn. 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) → 2PbSO 4 (s) + 2H 2 O(l) Identify which reactants are being oxidized (the oxidation number increases when it reacts) and which are being reduced (the oxidation number goes down). what is the oxidation number of pb in pbso4. Could you tell me how you went about getting the oxidation number for Pb in PbSO4? It is suggested that a precipitation mechanism to form PbSO 4 occurs under some conditions prior to the solid state … Also, the answer would not be +10 if what you had said was correct (about the sulfur ion). Pb in PbSO4 : +2. In order to make the compound neutral, Pb must be +2. Therefore oxidation number of Pb in PbSO 4 … Oxidation number of Pb is +2 Identify the products and the reactants, and then their oxidation numbers. How to calculate oxidation number of Pb in PbSO4?And Explain? pb +2 s-2 + h +1 2 o-1 2 → pb +2 s +6 o-2 4 + h +1 2 o-2 b) Identify and write out all redox couples in reaction. What is the oxidation number of phosphorous in the H3PO2 molecule? So, Pb is at +2 oxidation state. +1 +3 0-1 +2 +1. Expert Answer: Let the oxidation number of Pb=x. Therefore oxidation number of Pb is +2. Lead, being a metal, has very set oxidation numbers. To neutral that -2 charge, +2 charge should be there and it is given by Pb 2+ ion. ... Pb PbO2 PbSO4 H2O H2SO4. 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