Below is the balanced net-ionic chemical equation for an oxidation-reduction rea

ID: 534767 • Letter: B

Question

Below is the balanced net-ionic chemical equation for an oxidation-reduction reaction.

2 IO3- + 5 H3AsO3 + 2 H+ I3 + 5 H3AsO3 + H2O

Suppose 1 M solutions of each compounds are made in an excess acid solution, which of the following statements is correct?

1. If 50 mL of the IO3- solution is mixed with 20 mL of the H3AsO3 solution the compounds will be in their stoichiometric ratio

2. If 50 mL each of the IO3- and H3AsO3 solutions are mixed the compounds will be in their stoichiometric ratio

3. If 20 mL of the IO3- solution is mixed with 50 mL of the H3AsO3 solution the compounds will be in their stoichiometric ratio

4. None of these are correct

Ans 3) If 20mL of the IO3- solution is mixed with 50mL of the H3AsO3 solution the compounds will be in stoichiometric ratio.

Since the molar ratio of IO3- and H3AsO3 in the balanced ionic ratio is 2 : 5 , each IO3- requires 2.5 moles of H3AsO3.

20 mL of 1 M of IO3- has 0.020 moles

and 50 ml of H3AsO3 1M has 0.050 moles

ratio : 2 : 5

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