Lewis Acid and Base Chemistry
Calculate the concentration of the silver ion, Ag+ in a solution thatinitially is 0.10 M with respect to [Ag(NH3)2]+ . Kf for [Ag(NH3)2]+ =1.7 x 107.
1.1 x 10^-3M
Good luck!
:)
What is a complex ion?
A metal ion surrounded by coordinately bonded ligands.
What is the dissociation constant?
KD
What is a acid base adduct?
a compound that consists of a coordinate covalent bond between the lewis acid and lewis base
What are Lewis acids and bases?
acids and bases are determined by this concept buy their ability to accept or donate a pair of electrons and form a coordinate covalent bond
Relation between bronsted lowery acid and bases and lewis acids & bases?
all bronsted lowery acids and bases are called lewis acids and bases! But not all Lewis acids are bronsted
In complex ion questions, what states are all things in?
aq
Other name for coordinate covalent bonds?
dative bond
What is a lewis acid?
electron pair acceptor
What is a lewis base?
electron pair donor
How can insoluble AgCl made to be soluble in water?
form a complex ion by adding NH3 and creating a ligand exchange reaction
What is kf?
formation constant
How do you solve lewis acid and base naming questions?
have to draw Lewis structure!
How can you tell what is a lewis acid and base? (what type of moleucles)
if they are a cation or anion, they are a Lewis acid or base! However if they are neutral you have to look for if it is electron deficient!
Draw the lewis base lewis acid reaction between NH3 and BF3?
in notes!
What are ligands? What can they be?
ions or molecules that surround the central atom in a complex ion! (can be lewis bases or neutral molecules)
What does formation of complex ion do?
it increases solubility of salts
What does a large kf mean in terms of dissociation of complex ion?
large means very little complex ion will dissipate!
Zn+2 + 6CH3CN ----> Zn(CH3CN)2+ Does the highlighted reactant act as (can select more than one) Bronsted lowery acid Bronsted lower base lewis acid Lewis base
lewis acid
Is BF3 a Lewis acid, base or none?
lewis acid! (electron deficient)
BH3(aq) + NH3(aq) ----> BH3NH3(aq) Does the highlighted reactant act as (can select more than one) Bronsted lowery acid Bronsted lower base lewis acid Lewis base
lewis base
HCl(aq) + H2O (l) ----> Cl- + H3O+ Does the highlighted reactant act as (can select more than one) Bronsted lowery acid Bronsted lower base lewis acid Lewis base
lewis base bronsted lowery base
What ions can act as lewis acids? What do they do?
metal ions can act as this and form complex ions with lewis base in a solvent
Do all compounds that fit the Lewis definition meet the bronsted?Example?
no!---- coordinate compounds or complex compounds
What does it mean to be electron deficient?
not having enough electrons to fill octet on central atom
What is a displacement reaction?
one lewis base displaces another lewis base from an acid base adduct (or lewis acid)
How do you write the formation constant?
products/reactants
What is the formation constant?
the constant for the formation of a complex ion
What happens in terms of the ligand as the kf increases?
the ligand is better!
What is the dissociation constant measuring?
this is the formation constant for the reverse reaction!
What is a ligand exchange reaction?
this is when an acid base adduct's acid or base is replaced with a differecent acid or base creating a new acid or base
What is a coordinate covalent bond?
this is when one of the atoms provides both of the bonding electrons
Example of a simple coordinate covalent bond? Draw?
this occurs when a water molecule combines with hydrogen ion to form hydronium ion! The water is the base as it has the two pairs! When they share they know share the charge of the H+
How is a complex ion formed?
when one or more molecules or negatively charged ions(lewis base) bond to a central metal ion(Lewis acid)
Can you use rule of approximation complex ion questions?
yes!