Lodate ions react with iodide ions according to the equation below. A sample of sodium iodate with a mass of 0.311 g is dissolved in water and made up to 250. mL. 25.0 mL
portions are added to Kl that has been dissolved in sulfuric acid. The resultant iodine is
titrated against sodium thiosulfate, the average volume being 12.5 mL. Calculate the
molarity of the thiosulfate solution.
IO3- (aq)
+ 5I- (aq) + 6H+ (aq) ---> 3I2 (aq) + 3H2O (l)

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

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