Determination of Cu by Titration

Question 1

Subtitle

Answer 1

Complexometric titration

Question 2

What is complexometric titration?

Answer 2

When one or more strongly bonding lewis bases are attached to the copper cation forming a copper complex

Question 3

What is the titrant?

Answer 3

The complexing reagent, H4EDTA

Question 4

What actually complexes to the metal?

Answer 4

EDTA^4-

Question 5

What color indicator do we use?

Answer 5

Murexide

Question 6

If the ligand can form more than one coordinate covalent bond (likeEDTA) its called a

Answer 6

chelate, EDTA forms 6

Question 7

Murexide is added to the blue CU^2+ solution to produce purple, to get it clear you must…?

Answer 7

Add the exact amount of EDTA to bind all of the metals

Question 8

The changes in color will be

Answer 8

purple - yellow - violet

Question 9

Why do we add NH4Cl and NH4OH?

Answer 9

to buffer the solution

Question 10

Ppm is equal to:

Answer 10

mg/liter

Question 11

Whats the coordination number of copper and EDTA?

Answer 11

6

Question 12

What is the oxidation number of the copper in complex?

Answer 12

+2

Question 13

EDTA^4- is best described as a _______ ligand.

Answer 13

hexadentate