Question

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Balance the reaction between H3AsO4 and NO to form H3AsO3 and NO3- in acidic solution. When...

Balance the reaction between H3AsO4 and NO to form H3AsO3 and NO3- in acidic solution. When you have balanced the equation using the smallest integers possible, enter the coefficients of the species shown.

H3AsO4 + NO = H3AsO3 + NO3-


Water appears in the balanced equation as a  (reactant, product, neither) with a coefficient of ------. (Enter 0 for neither.)

How many electrons are transferred in this reaction -------- ?

Solutions

Expert Solution

The unbalanced chemical equation is

The oxidation number of As decreases from +5 to +3. Total decrease in the oxidation number is 2.

The oxidation number of N increases from +2 to +5. Total increase in the oxidation number is +3.

Balance increase in the oxidation number with decrease in the oxidation number by multiplying As species with 3 and N species with 2.

Balance O atoms by adding water molecule to left hand side.

Balance H atoms by adding 2 protons to right hand side.

This is balanced chemical equation.

Water appears in the balanced equation as a reactant with a coefficient of 1.

Six many electrons are transferred in this reaction. The oxidation number of one As atom changes by 2. For 3 As atoms, the change in the oxidation number is 6. This corresponds to transfer of six electrons.


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