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how to balance redox reaction in acidic med. HSO 4 - +As 4 +Pb 3 O 4 = PbSO 4 +H 2 AsO 4 -
1)First write down the half reactions:- a) Oxidation Half Reaction – As40 is getting oxidised to As+5 . Now balance the reaction by first balancing the main atom and then by adding electrons As40 ------- 4As+5 + 20e- ….….….…..(1) b)Reduction half reaction – Here (Pb3)+8 is getting reduced to Pb+2 Now balance the reaction by first balancing the main atom and then by adding electrons 2e-+(Pb3)+8 ---------- 3Pb+2….….…..(2) 2)Now as the electrons added are not equal in both the halfs make it equal by multiplying (2) by 10.. As40-------4As+5+20e-20e-+10(Pb3)+8 -------30Pb+2 3)Now add both the reactions to obtain the stoichiometric coefficients...As40+10(Pb3)+8----------4As+5+30Pb+2 4)Then write them in their reaction form.HSO4- +As4 +10Pb3O4 ------- 30PbSO4+4H2AsO4-5)Now balance the other main atoms , here S is unbalanced.30HSO4+As4 +10Pb3O4 ------ 30PbSO4+4H2AsO46)Now balance the no of oxygens by adding H2O30HSO4+As4 +10Pb3O4 ------ 30PbSO4+4H2AsO4+24H2O7)Finally balance the no of hydrogen atoms by adding H+ ions to the other side.30HSO4+As4 +10Pb3O4+26H+ ------ 30PbSO4+4H2AsO4+24H2OTHE BALANCED REACTION:-30HSO4+As4 +10Pb3O4+26H+ ------ 30PbSO4+4H2AsO4+24H2O
1)First write down the half reactions:- a) Oxidation Half Reaction – As40 is getting oxidised to As+5 . Now balance the reaction by first balancing the main atom and then by adding electrons As40 ------- 4As+5 + 20e- ….….….…..(1) b)Reduction half reaction – Here (Pb3)+8 is getting reduced to Pb+2 Now balance the reaction by first balancing the main atom and then by adding electrons 2e-+(Pb3)+8 ---------- 3Pb+2….….…..(2) 2)Now as the electrons added are not equal in both the halfs make it equal by multiplying (2) by 10.. As40-------4As+5+20e-20e-+10(Pb3)+8 -------30Pb+2 3)Now add both the reactions to obtain the stoichiometric coefficients...As40+10(Pb3)+8----------4As+5+30Pb+2 4)Then write them in their reaction form.HSO4- +As4 +10Pb3O4 ------- 30PbSO4+4H2AsO4- 5)Now balance the other main atoms , here S is unbalanced.30HSO4+As4 +10Pb3O4 ------ 30PbSO4+4H2AsO4 6)Now balance the no of oxygens by adding H2O30HSO4+As4 +10Pb3O4 ------ 30PbSO4+4H2AsO4+24H2O 7)Finally balance the no of hydrogen atoms by adding H+ ions to the other side.30HSO4+As4 +10Pb3O4+26H+ ------ 30PbSO4+4H2AsO4+24H2O THE BALANCED REACTION:-30HSO4+As4 +10Pb3O4+26H+ ------ 30PbSO4+4H2AsO4+24H2O
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