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11 Nov 2019

The diprotic amind leucine (HL) is amphiprotic. As such, to quanitfy species in solution the chemistry must be treated systematically. Suppose a .1M solution has the following chemistry:

HL (aq) â H+ (aq) + L- (aq)
HL (aq) + HOH â H2L (aq) + OH- (aq)

Write a system of mass balance for this reaction.

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Patrina SchowalterLv2

3 May 2019

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A soultion is prepared by mixing Mt moles of the salt MCl2 (which dissociates completely to M^2+ +2Cl-) and Lt moles of the ligand HL in 1 L. The following reactions may occur:

M^2+ + L- <------>ML+ K=1.0x10^8 HL(aq) <------> L- + H+ Ka= 1.0x10^-5

a) Write a mass balance for the metal species.

b) Write a mass balance for the ligand species. c) write a charge balance

d) Suppose that Mt=Lt=0.1 M (exactly) and the pH is somehow fixed at 5.00. ( This means that the charge balance no longer applies.) Use the equilibria and the two mass balances to find the concentrations of ML+, M^2+, L-, and HL.

A solution is prepared by mixing Mt molesof the salt MCl2 (whichdissociates completely to M+2 + 2Cl-) and Lt moles of the ligand HLin 1L. The following reactions may occur:

M+2 + L ---> ML+ K=1.0e8

HL (aq) ----> L- + H+ Ka=1.0e-5

a- Write a mass balance for the metal species

b- Write a mass balance for the ligand species

c- Write a charge balance

d- Suppose that Mt=Lt=0.1M (exactly) and the pH is somehow fixedat 5.00. (This means that the charge balance no longer applies.)Use the equilibria and the two mass balances to find theconcentrations of ML+, M+2, L-, HL.

lemonmanatee392

A solution is prepared by mixing Mt molesof the salt MCl2 (whichdissociates completely to M+2 + 2Cl-) and Lt moles of the ligand HLin 1L. The following reactions may occur:

M+2 + L ---> ML+ K=1.0e8

HL (aq) ----> L- + H+ Ka=1.0e-5

a- Write a mass balance for the metal species

b- Write a mass balance for the ligand species

c- Write a charge balance

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