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Chapter 10: Q10DE (page 229)

Calculate the pH of a0.010Msolution of each amino acid in the form drawn here


Short Answer

Expert verified

The isoionic Ph is =10.37

Step by step solution

01

Step 1: Define the term isoionic ph.      

When a pure, neutral polyprotic acid is dissolved in water, the isoionic point or isoionic pH is obtained.

The isoelectric point is the pH at which the polyprotic acid's average charge is zero (0).

02

Calculate the isoionic PH

The pH of a neutral, polyprotic molecule in pure solution.

The only ions present areH+,OH-

Isoionic is the name given to polyprotic species.

H+=K2K3F+K2KwK2+F

Where F is the formal concentration.

Here Arginine has four forms H3A2+,H2A+,HAandA-

HA form shown as

H+=K2K30.010+K2KwK2+0.010

=4.28脳10-11MpH=10.37

Thus the isoionic Ph is=10.37

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Most popular questions from this chapter

Approximately what fraction of ammonia is in the form NH3at pH11?

(a) Copy column B of your spreadsheet and paste it into columnG. ChangeK1to10-4in cell G5 and change K2 to 10-8 in cell G6. Change F to 0.01 in cell G8. Column G now contains concentrations for the amphiprotic salt Na+HA-withK1=10-4,K2=10-8, andF=0.01M. Check the answers by hand beginning with pH=12(pK1+pK2). With[HA-],F, calculate[H2A]and[A2-]. Then find[HA-]>>F-[H2A]-[A2-].

(b) Copy column G of your spreadsheet and paste it into column H. Change K2 to 10-5 in cell G6. Column G now contains the concentrations for the intermediate form of a diprotic acid with K1=10-4, K2=10-5, and F =0.01M. You should observe[HA-]=6.13脳10-3Mand pH=4.50.

Draw the structures of the predominant forms of glutamic acid and tyrosine at pH9.0and pH10.0What is the second most abundant species at each ?.

10-37. Which four amino acids in Table 10-1have acidic substituents (that donate a proton) and which three have basic substituents (that accept a proton)?

A solution containing acetic acid, oxalic acid, ammonia, and pyridine has a pHof 9.00. What fraction of ammonia is not protonated?
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