Conjugate Acid/ Base Pairs In the reactions below label the Bronsted-Lowry Acid.

Question

Conjugate Acid/ Base Pairs

In the reactions below label the Bronsted-Lowry Acid. Base, Conjugate Acid, and Conjugate Base. HSO_4(aq) + H_2O(1) rightarrow H_2SO_4(aq) + OH^-(aq) NH_3(g) + H_2O(1) rightarrow NH_4^+ + OH^-(aq) CH_3COO^-(aq) + H_2O(1) rightarrow CH_3COOH(aq) + OH^-(aq) NH_3(g) + H_2CO_3(aq) rightarrow+(aq) + HCO_3^- (aq) Give the chemical formula of the conjugate acid or base for the following species. If the species is amphoteric provide both the conjugate acid and conjugate base. HF H_3PO_4 HCO_3^-

Explanation / Answer

a. HSO4- + H2O ---------> H2SO4    +    OH-

    Base          acid    conjugate acid    conjugate base

   H2SO4 and HSO4- are conjugate acid base pair. H2O and OH- are conjugate acid base pair.

b.    NH3    +     H2O -----------> NH4+    + OH-

   base         acid    conjugate acid          conjugate base

       NH4+ and NH3 are conjugate acid -base pair

        H2O and OH- are conjugate acid-base pair

c. CH3COO- + H2O ----------> CH3COOH    + OH-

    base            acid                  conjugate acid             conjugate base

     CH3COOH and CH3COO- are conjugate acid base pair.

      H2O and OH- are conjugate acid - base pair.

d. NH3 + H2CO3 ----------> NH4+           +              HCO3-

base      acid                       conjugate acid            conjugate base

       NH3 and NH4+ are conjugate acid-base pair.

        H2CO3 and HCO3- are conjugate acid- base pair.

2. a. HF is acid

   b. H3PO4 is acid

c. HCO3- is act as conjugate acid or conjugate base.

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