Question

Write the dissociation reaction for the following acids in water H₂O. State whether the acid is a strong acid or a weak acid. Is the reaction reversible? Identify the acid, base, conjugate acid, and conjugate base.

State the Dissociation reaction, Strong or Weak Acid, Is it reversable, Acid, Base, Conjugate Acid, Conjugate Base for each. PLEASE SHOW WORK, AND EXPLAIN.

1. H₂CO₃

2.HCI

3. HNO₃

4. Write the equation that represents the reaction of hydrochloric acid in water.

Conjugate acid-base pair that includes hydrochloric acid:

Conjugate acid-base pair that does not include hydrochloric acid:

Does water act as an acid or a base in this reaction?

Answer 1

Answer –

1) We are given acid H₂CO₃ and when we put it in the water there is dissociation of H₂CO₃. We know dissociation means splitting the molecules into ions.

H₂CO₃ Ka value is 4.3 *10^-7 which too small means there is very less dissociation is and we know when incomplete dissociation then there is weak acid or base. So H₂CO₃ is weak acid and there is reversible reaction.

H₂CO₃(aq) + H₂O(l) <------>    H₃O⁺ (aq)         +         HCO₃^-(aq)

Acid         Base                        Conjugate acid    Conjugate base

2) We are given acid HCl and when we put it in the water there is dissociation of HCl. The Ka value of HCl greater than 1 means there is complete dissociation is and we know when complete dissociation then there is strong acid or base. So HCl is strong acid and there is irreversible reaction.

HCl(aq) + H₂O(l) ------>    H₃O⁺ (aq)         +         Cl^-(aq)

Acid          Base                        Conjugate acid    Conjugate base

3) We are given acid HNO₃ and when we put it in the water there is dissociation of HNO₃. The Ka value of HNO₃ greater than 1 means there is complete dissociation is and we know when complete dissociation then there is strong acid or base. So HNO₃ is strong acid and there is irreversible reaction.

HNO₃ (aq) + H₂O(l) ------>    H₃O⁺ (aq)         +         NO₃^- (aq)

Acid          Base                        Conjugate acid    Conjugate base

4) Conjugate acid base pair of hydrochloric acid including the hydrochloric acid

HCl(aq) + H₂O(l) ------>    H₃O⁺ (aq)         +         Cl^-(aq)

Acid          Base                        Conjugate acid    Conjugate base

Conjugate acid base pair of hydrochloric acid without including the hydrochloric acid

H₂O(l) + H⁺ (aq) ------> H₃O⁺(aq)