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

Calculate the number of photons per second, What is the percentage of light...

What is the percentage of light that is engaged by the sample after a path length of 1 µm? Calculate the number of photons per second absorbed by the sample.   T

Illustrate objectives of heat treatment processes, Illustrate objectives of...

Illustrate objectives of heat treatment processes Heat treatment is normally adopted for the following: (i) To refine grain structure (ii) To improve machinability (ii

Orbital angular momentum of an electron in 2s -orbital, The orbital angular...

The orbital angular momentum of an electron in 2s -orbital is: (1) 1/2 h/ 2Π                              (2) h/ 2Π (3) √2 h/ 2 Π                      (4) Zero Ans

Inversion of cane sugar, Inversion of cane-sugar : The hydrolysis of s...

Inversion of cane-sugar : The hydrolysis of sucrose through boiling along with a mineral acid or through enzyme invertase, generates a mixture of equal molecules of D-glucose

Total number of valence electron, The total number of valence electrons in ...

The total number of valence electrons in 4.2 gm N - 3   of ion is ( N A is the Avogadro's number): (1) 1.6N A                               (2) 3.2N A

Principle underlying the quantitative analysis, Principle underlying the qu...

Principle underlying the quantitative analysis: In flame photometry, the thermal energy from flame is utilized to convert the analyte within gaseous atoms and then to excite t

Determine infrared moisture balance in flour, Q. Determine Infrared moistur...

Q. Determine Infrared moisture balance in flour? Infrared moisture balance is an instrument for measuring the moisture content of materials that do not change their chemical

Chemical equations, why is it useful to use moles to measure chemical quant...

why is it useful to use moles to measure chemical quantities

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