   Chapter 14, Problem 6ALQ

Chapter
Section
Textbook Problem

# Consider two separate aqueous solutions: one of a weak acid HA and one of HCl. Assuming you started with 10 molecules of each:a. Draw a picture of what each solution looks like at equilibrium.b. What are the major species in each beaker?c. From your pictures, calculate the Ka values of each acid.d. Order the following from the strongest to the weakest base: H2O, A−. Cl−. Explain your order.

(a)

Interpretation Introduction

Interpretation: The situation of equilibrium of the mixture of HA and HCl , major species in a mixture of weak acid HA and HCl , Ka value calculation of each acid, order for strong base among given compounds.

Concept introduction: Strong acids dissociate completely and rapidly in aqueous medium while weak acids dissociates slowly and up to a certain level only. A strong base is the one having the potential to accept a proton rapidly.

To determine: The situation at equilibrium of the mixture of HAandHCl .

Explanation

Explanation

The compound HCl being a strong acid will dissociate completely and rapidly and reaction will be in forward direction completely.

HClH++Cl

But HA is a weak acid and it would not be dissociating completely and equilibrium will be established due to slow and small extent of dissociation

(b)

Interpretation Introduction

Interpretation: The situation of equilibrium of the mixture of HA and HCl , major species in a mixture of weak acid HA and HCl , Ka value calculation of each acid, order for strong base among given compounds.

Concept introduction: Strong acids dissociate completely and rapidly in aqueous medium while weak acids dissociates slowly and up to a certain level only. A strong base is the one having the potential to accept a proton rapidly.

To determine:  the major species in a mixture of weak acid HA and HCl

(c)

Interpretation Introduction

Interpretation: The situation of equilibrium of the mixture of HA and HCl , major species in a mixture of weak acid HA and HCl , Ka value calculation of each acid, order for strong base among given compounds.

Concept introduction: Strong acids dissociate completely and rapidly in aqueous medium while weak acids dissociates slowly and up to a certain level only. A strong base is the one having the potential to accept a proton rapidly.

To determine: The Ka value calculation of HCl and HA .

(d)

Interpretation Introduction

Interpretation: The situation of equilibrium of the mixture of HA and HCl , major species in a mixture of weak acid HA and HCl , Ka value calculation of each acid, order for strong base among given compounds.

Concept introduction: Strong acids dissociate completely and rapidly in aqueous medium while weak acids dissociates slowly and up to a certain level only. A strong base is the one having the potential to accept a proton rapidly.

To determine: The order for strong base among given compounds.

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