Henderson-hasselbalch equation, Chemistry

Assignment Help:

(a) Explain in terms of ionic equilibria why the aqueous solution of a salt derived from a weak acid and a strong base (e.g. sodium phenolate) has a pH greater than 7.

(b) By considering the equilibrium constant (Ka) of a weak acid, and the effect on Ka when a salt of that acid is added to the solution, derive the Henderson-Hasselbalch equation for buffer solution pH.

(c) Explain why the Henderson-Hasselbalch equation sometimes features a term written as + log10 gA- where gA- represents the activity coefficient of the common anion, and hence describe the effect of increasing the concentration of both the acid and salt in the buffer formulation on buffer performance.

(d) An aqueous buffer solution is formulated containing 0.010 mol dm-3 sodium phenolate to which phenol is added. Given that the pKa of phenol is 9.98, calculate the concentration of phenol required to produce a pH of exactly 9.65 (you may assume that gA- = 1).


Related Discussions:- Henderson-hasselbalch equation

Lactic acid, chemical reaction of lactic acid

chemical reaction of lactic acid

Chemical kinetics is study of the rates of chemical process, Chemical kinet...

Chemical kinetics is study of the rates of chemical processes.                                                                         The detailed explanation at molecular leve

Equilibrium-octahedral complexes have geometric isomers , 1. A 50.0-L react...

1. A 50.0-L reaction vessel contains 1.00 mol N2, 3.00 mol H 2 , and 0.500 mol NH 3 . Will more ammonia, NH 3 , be formed or will it dissociate when the mixture goes to equilibrium

Calculate Wavelength, Ask question #Minimum 100 words acceWhen an electron ...

Ask question #Minimum 100 words acceWhen an electron beam strikes a block of copper, x-rays of frequency 1.07 x 10 19 Hz are emitted. What is the wavelength of these x-rays?pted#

Determine energy level, For n= 3 energy level, the number of possible orbit...

For n= 3 energy level, the number of possible orbitals (all kinds) are: (1) 1        (2) 3         (3) 4       (4) 9 Ans: 9

Thermodynamics, What are the limitations of second law of thermodynamics?

What are the limitations of second law of thermodynamics?

Explain the winnowing and primary processing of wheat, Explain the Winnowin...

Explain the Winnowing and Primary processing of wheat  Winnowing: In this process, the impurities are  separated on the principle that their density differs from that of the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd