Consider Cl – (aq) and NO3 – (aq) at 25 o C. (a) What are the conjugate acids of

Question

Consider Cl– (aq) and NO3– (aq) at 25oC.

(a) What are the conjugate acids of Cl– (aq) and NO3– (aq)?

(b) Write the base hydrolysis equilibria for Cl– (aq) and NO3– (aq).

(c) Calculate Ho (kJ), So (J/K), Go (kJ), and Kb for the equilibria in (b).

(d) Which is the stronger base at 25oC, Cl– (aq) or NO3– (aq)? Explain your choice.

(e) Using your answers to (a), (c), and (d), which conjugate acid is stronger at 25oC, the conjugate acid of Cl– (aq) or the conjugate acid of NO3– (aq)? Explain your choice.

Explanation / Answer

(a): Conjugate acid of Cl-(aq) is HCl

Conjugate acid of NO3-(aq) is HNO3

(b): Cl-(aq) + H2O ----- > HCl + OH-(aq); Kb1

NO3-(aq) + H2O ------ > HNO3 + OH-(aq): Kb2

(c): Kb1 = 7.7x10-21

Kb2 = 4.17x10-16

(d): NO3-(aq) is a stronger base in comparison to Cl-(aq) at 25 DegC, because the equilibrium cnstant for the hydrolysis of NO3-(aq) is higher in comparison to  Cl-(aq).

(e) The conjugate acid of Cl-(aq) is stronger at 25 DegC, because Cl-(aq) is a weaker base.

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.