Fe2+ and O2 are reacting in basic medium to form solid Fe(OH)3. Hence, the unbalanced equation we can write is
Now, Fe is in +2 state in Fe2+ and +3 state in Fe(OH)3.
Hence, Fe2+ is being oxidised.
Hence, the oxidation half reaction is
O is in 0 oxidation state in O2. We can assume that O2 is being reduced to H2O (which is the reaction medium) in which O has an oxidation state of -2.
Hence, the reduction half reaction is
Now, lets balance the oxidation half
Number of Fe atom is balanced.
To balance the number of O atoms, we add 3 H2O on the left.
Now, there are 6 H on left and 3 H on right. Hence, we add 3 H+ on right to balance the number of H atom.
Since the reaction is being carried out in basic medium, we cannot have H+ in reaction, hence, we neutralise the H+ to H2O by adding equivalent amount of OH- on both side
Now, there are 2-3 = -1 charges on left and no charges on right. Hence, we add an electron on the right to balance the charges. Hence, the balanced oxidation half is
Now, we will balance the reduction half
To balance the O atoms, we multiply 2 on H2O
To balance the H atoms, we add 4H+ on left.
Since medium is basic, we add 4OH- on both side
Now, to balance the charges, we add 4 e on the left. Hence, the balanced reduction half is
Note that 4 e are involved in reduction half and 1 e involved in oxidation half, hence, to cancel the number of electrons when we add, we multiply 4 throughout the oxidation half reaction and add it with reduction half reaction.
Hence,
+
=
Hence, the balanced net ionic equation is
The brown residues that collect along the inner walls and bottoms of toliet tanks are made...
Sample Exercise 8.12 The brown residues that collect along the inner walls and bottom of toilet tanks are made mostly of solid Fe(OH), that formas when one in water are oxidized by dissolved o Write a balanced net ionic equation for this reaction in a slightly basie solution.
When you write the answers, please write the page number for which the question is located. Thank you! Experiment 8 Name: Double Replacement Reactions Background: Some reactions have the net effect of causing the cation of cach reactant to trade places, forming a compound with the other anion. These reactions are known as double replacement reactions. In the example below (unbalanced equation), the barium and sodium cations switch places so that barium forms a product with sulfate while sodium forms...
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