Show the pertinent equilibrium and equilibrium constant expression 1Calculate th

Question

Show the pertinent equilibrium and equilibrium constant expression
1Calculate the PH of a 0.15M N2H4 solution. (Weak base problem)
2Calculate the PH of a 0.15M N2H5Cl solution. (hydrolysis of a cation of a weak base) Show the pertinent equilibrium and equilibrium constant expression
1Calculate the PH of a 0.15M N2H4 solution. (Weak base problem)
2Calculate the PH of a 0.15M N2H5Cl solution. (hydrolysis of a cation of a weak base) Show the pertinent equilibrium and equilibrium constant expression

2Calculate the PH of a 0.15M N2H5Cl solution. (hydrolysis of a cation of a weak base)

Explanation / Answer

Ans 1

Basis - 1 L of solution

The balanced chemical equation is

N2H4 + H2O <----> N2H5+ + OH-

The dissociation constant

Kb for hydrazine = 1.3*10^-6

Let x be the moles of hydroxide ions

Kb = [N2H5] [OH-] / [N2H4]

1.3 x 10^-6 = x^2/ 0.15-x

x = [OH-]= 0.00044 M
pOH = - log [0.00044] = 3.35

pH = 14 - 3.35 = 10.65

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

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