A number of chemical reactions, relevant to different applications, are shown be

Question

A number of chemical reactions, relevant to different applications, are shown below. All of these reactions are either acid/base or redox. a. Label each reaction as acid/base or redox. b. For the acid/base reactions, identify the acid and base in the reactants. For the redox reactions, identify which reactant is oxidized and which is reduced. Acid/Base or Redox? Humans use oxygen (O_2) for metabolism. Some bacteria use sulfate instead: CH_4 (aq) + SO_4^2- (aq) HCO_3^- (aq) + HS^- + H_2 O Cement's primary component is CaO. When water is added to make concrete, Ca(OH)_2 is generated and provides a natural protection to steel structures used in conjunction with concrete. Over time, the Ca(OH)_2 reacts with H_2 CO_3, destroying the protective nature of concrete. Ca(OH)_2 (aq) + H_2 CO_3 (aq) CaCO_3 (S) + 2 H_2 O (l)

Explanation / Answer

1. Reaction given below is Redox reaction. redox reaction involves transfer of electron between two species. Itis also caled as oxidation-reduction reaction. It consist of two parts, a reduced half and an oxidized half. The reduced half gains electrons and while the oxidized half loses electrons.

CH4 + SO42 HCO3 + HS + H2O

In this methane is oxidized with electron acceptors such as sulfate

While SO42 is reduced.

2. This reaction is acid base reaction. In this Ca(OH)2 is base while H2CO3 is an weak acid. The H(+) cation of the acid combines with the OH(-) anion of the base to form water. While cation of acid (Ca2+) and anion of base (CO32-) forms salt (CaCo3)

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