Chapter U6, Problem 10STP

Interpretation Introduction

Interpretation:

The correct chemical process which is represented by this graph needs to be identified.

Concept introduction:

When the numbers of tries increases, number of molecules gradually increases and after that it gradually reaches to a maximum point. At this point, the new molecules added to that sample finally go to saturation.

Answer to Problem 10STP

(B) A strong acid such as HBr, Which separate to H⁺(aq) +Br^-(aq).

Explanation of Solution

Reason for correct option:

• Weak acid does not dissociate completely in aqueous solution. But the strong acid dissociates completely into its ions in aqueous solution.
• When the number of tries increases the number of molecules increases in the solution. The dissociation of adding molecule takes place at faster rate after increasing the number of molecules.
• Initially, the reactant is at point 50 and product at point 0. As reaction moves in forward direction, the number of molecules of reactant starts decreasing and that of product increases.
• This increased number of molecules of products leads to the saturation point in the solution. Where no more solute can added to the solution.
• The HBr dissociates completely into H+ and Br^-, as HBr is a strong acid. This graph demonstrate the dissociation of strong acid HBr.

$\text{HBr}\to {\text{ H}}^{+}+{\text{ Br}}^{-}$

Conclusion

Reasons for incorrect options:

(A) The NaCl in salt solution completely dissociate into ions as Na+ and Cl^-.

$NaCl\to N{a}^{+}+C{l}^{-}$

When Salt NaCl is added gradually then the number of molecule gets dissociates and reaches its saturation point where after some raise a constant in the graph or a straight line appear in the graph.

(C) An acid base indicator, HIn, Which separates to H⁺(aq) + In^-(aq).

Indicator does not dissociates completely and they only used for the indicating the completion of the Titration reaction. between a known concentration of acid with a unknown concentration of base.

(D) After bonding with the receptor molecule, the separation of molecule occur after that the molecule leaves the receptor to empty the receptor. This graph does not indicate the binding of receptor.