00:01
Dear students, we are given a equation mn2 plus plus bio3 minus gives rise to bi3 plus plus mno4 minus in the basic medium.
00:08
We have to balance this equation and we have to find out the coefficient of the hydroxide ion.
00:15
Now to balance this equation, let us use oxidation number method.
00:22
Here manganese 2 plus, here it is 7 plus.
00:28
Therefore there is an increase in oxidation number of 5 units.
00:33
Now here bismuth is in the 5 plus state and it is in the 3 plus, it is getting reduced.
00:42
So there is a decrease in, here increase in 5 units and decrease in 2 units.
00:50
Now to make same, let us multiply by 2 and this one multiplied by 5.
00:56
Therefore we will get the equation like this, 2 mn2 plus plus 5 bio3 minus gives rise to 5 bi3 plus plus 2 mno4 minus.
01:18
Now we will see here manganese and bismuth are balanced.
01:23
Now we will balance oxygen atoms because the medium is here basic medium.
01:29
So to balance oxygen atoms we have to add water molecule here.
01:33
15 oxygen atoms are here but here we have 8.
01:37
So we will add 7 water molecules to the right side.
01:40
So that both sides will get 15 oxygen atoms.
01:44
5, 3 are 15, here 8, so 8 plus 7 is 15.
01:48
Now you have to balance hydrogen finally...