Which of the following is an oxidation-reduction reaction? Which of the following is an oxidation-reduction reaction? Ba (C2H3O2) 2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaC2H3O2 (aq) Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2 (aq) HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq) AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq) H2CO3 (aq) + Ca (NO3) 2 (aq) → 2HNO3 (aq) + CaCO3 (s)

Question

Chemistry

Nathanial Williamson

6 September, 11:34

Which of the following is an oxidation-reduction reaction? Which of the following is an oxidation-reduction reaction? Ba (C2H3O2) 2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaC2H3O2 (aq) Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2 (aq) HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq) AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq) H2CO3 (aq) + Ca (NO3) 2 (aq) → 2HNO3 (aq) + CaCO3 (s)

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Answers (1)

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Milo Gray · Answer 1

The only oxidation - reduction reaction is Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2

Explanation:

An oxidation-reduction reaction is a chemical reaction that involves an electron transfer between two species. This will lead to a change in oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.

Some atoms have different possible oxidation numbers.

H has oxidation number + 1

O has oxidation number - 2

The oxidation number of an individual atom is 0.

The total oxidation number of all atoms in: a neutral species is 0 and in an ion is equal to the ion charge.

⇒ Ba (C2H3O2) 2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaC2H3O2

(C2H3O2) 2 has an oxidation number of - 2. So Ba has an oxidation number of + 2

In BaSO4 has SO4 an oxidation number of - 2 and Ba has an oxidation number of + 2

This means Ba doesn't change its oxidation number.

In Na2SO4 Na has an oxidation of + 1; in NaC2H3O2 Na has an oxidation of + 1

This means Na doesn't change its oxidation number.

⇒ Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2

Cu has an oxidation number of 0

In Cu (NO3) 2, NO3 has an oxidation number of - 1 so Cu has an oxidation number of + 2

In 2AgNO3, NO3 has an oxidation number of - 1 so Ag has an oxidation number of + 1

Ag has an oxidation number of 0

⇒ HCl (aq) + NaOH (aq) → H2O (l) + NaCl

The oxidation number of Cl and Na do not change

⇒ AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3

In AgNO3 Ag has an oxidation number of + 1

In AgCl Ag has an oxidation number of + 1

In HCl Cl has an oxidation number of - 1

In AgCl Cl has an oxidation number of + 1

The oxidation number of Cl and Ag do not change

⇒ H2CO3 (aq) + Ca (NO3) 2 (aq) → 2HNO3 (aq) + CaCO3 (s)

In Ca (NO3) 2 Ca has an oxidation number of + 2

In CaCO3 Ca has an oxidation number of + 2

In Ca (NO3) 2 N has an oxidation number of + 5

In HNO3 N has an oxidation number of + 5

In H2CO3 C has an oxidation number of + 4

In CaCO3 C has an oxidation number of + 4

The only oxidation - reduction reaction is Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2

Oxidizing agent: Ag; Reducing agent: Cu