M-Introduction

Question 1

___ ___ is a form of volumetric analysis in which the formation of a colored complex is used to indicate the end point of a titration.

Answer 1

Complexation Titration

Question 2

Complexation Titration is also sometimes called ____

Answer 2

chelatometry

Question 3

Chelatometry is a form of volumetric analysis in which the formation of a ____ ___ is used to indicate the end point of a titration.

Answer 3

colored complex

Question 4

Complexometric titrations are particularly useful for the determination of a mixture of different ___ ___ in solution

Answer 4

metal ions

Question 5

Complexometric titration is based on the fact the certain organic compounds form ____ ____ with metal ions in solution.

Answer 5

stable complexes

Question 6

What are complexation titrations based on?

Answer 6

reaction of metal ion with chemical agent

Question 7

What does the reaction of metal ion with a chemical agent form?

Answer 7

metal-ligand complex

Question 8

What is does EDTA stand for?

Answer 8

Ethylenediaminetetraaceticacid

Question 9

In Lewis acid-base theory, metal is considered as the?

Answer 9

Lewis Acid or Electron-pair acceptor

Question 10

In Lewis acid-base theory, the ligand is considered as the?

Answer 10

Lewis Base or Electron-pair donor

Question 11

How many carboxyl groups and amine groups does EDTA have?

Answer 11

4 carboxyl and 2 amine

Question 12

What type of dentate ligand is EDTA?

Answer 12

hexadentate

Question 13

What is the most common complexometric titrant?

Answer 13

EDTA

Question 14

EDTA forms 1:1 complexes with the majority of metals except which group?

Answer 14

1A Metals

Question 15

EDTA is normally used like a ___ ___ to increase the solubility.

Answer 15

sodium salt

Question 16

EDTA forms stable ____ ___ complexes and is a primary standard.

Answer 16

water soluble

Question 17

What are the 10 metals that EDTA forms stable complexes with?

Answer 17

Ba2+, Ca2+, Cd2+, Fe2+, Fe3+, Hg2+, Mg2+, Mn2+, Ni+2, Sr2+

Question 18

In the textile industry, EDTA prevents metal ion _____ from modifying colors of dyed products.

Answer 18

impurities

Question 19

In the pulp and paper industry, EDTA ___ the ability of metal ions.

Answer 19

inhibits

Question 20

EDTA is added to some food as a ____ or ____.

Answer 20

preservative or stabilizer

Question 21

In cosmetics, EDTA salts are used as a ____ ___ to improve their stability in air.

Answer 21

sequestering agent

Question 22

____ ___ is used for treating mercury and lead poisoning.

Answer 22

Chelation Therapy

Question 23

This therapy is used to treat the complication of repeated blood transfusions, as would be applied to treat thalassemia.

Answer 23

Chelation Therapy

Question 24

Dentists and endodontists used EDTA solutions to remove ____ ___ (smear layer) and ___ the canals in endodontics.

Answer 24

inorganic debris, lubricate

Question 25

In evaluating kidney function, the complex _____, is administered intravenously and its filtration into the urine is monitored (GFR).

Answer 25

Cr(EDTA)

Question 26

It serves as a preservative in ___ ___ and ____.

Answer 26

ocular preparations and eyedrop

Question 27

EDTA is used extensively in the analysis of ____.

Answer 27

blood

Question 28

EDTA is an _____ for blood samples for CBC/FBEs.

Answer 28

anticoagulant

Question 29

What are the two types of titration with EDTA?

Answer 29

direct and back (indirect) titration

Question 30

In Direct Titration, the cations are titrated directly with standard solution EDTA using ____ ___ ___ as indicator.

Answer 30

Eriochrome Black T

Question 31

A known excess of standard solution EDTA is added to the solution containing the analyte. When the reaction is complete, excess EDTA is back titrated to the end point using a ___ or ___ standard solution with Eriochrome black T.

Answer 31

magnesium or zinc

Question 32

This procedure is useful for determining cations that form stable complexes with EDTA and for which there is no effective indicator. It is also often used for those species of ions which react very slowly with EDTA.

Answer 32

Back Titration

Question 33

A ____ ___ decreases the concentration of a free metal ion to a level where a particular interfering reaction will not occur.

Answer 33

masking agent