Unit 2 Equilibrium - Part 2

Question 1

Denticity

Answer 1

the number of coordinate bonds to a central metal ion

Question 2

Chelating agent

Answer 2

non-cyclic, multidentate ligand. Chelating agents bind metal ions to form chelates

chelates are a type of metal-ligand complexes

Question 3

Cryptand

Answer 3

polycyclic, multidentate ligands. Cryptands bind metal ions to form cryptates

cryptands are a type of metal-ligand complexes

Question 4

EDTA

Answer 4

binds to chelating agent. If you put EDTA is solution, it will try to find metals and bind to it. It is a polyprotic acid

Uses:
it can help detoxicate people with heavy metal poisoning by binding to extra metals
intravenous administration with Ca2+ and Mg2+

Question 5

For a sparingly soluble salt of a weak base, MA, the solubility increases as pH decreases. Why?

Answer 5

at pH values less than the pKa of the conjugate acid, the acid-base equilibrium shifts strongly in favour of the conjugate acid, which pulls more of the dissociated salt into the solution

Question 6

The solubility of a precipitate increases in the presence of an agent that can complex the cation. Why?

Answer 6

the complexing agent helps to pull the precipitate into the solution