Reagents And Titration

Question 0

Substance that is consumed during the course of the chemical reactionp

Answer 0

Reactant

Question 1

A substance or compound that is added to a system in order to bring about a chemical reaction or see if a chemical reaction occurs

Answer 1

Reagent

Question 2

A solution of hydrogen peroxide and an iron catalyst

Answer 2

Fenton’s reagent

Question 3

Uses of fenton’s reagent

Answer 3

• oxidizing contaminants or waste waters

* destroy organic compounds such as trichloroethylene (TCE) and tetrachloroethylene (PCE)

Question 4

Used to differentiate between water-soluble carbohydrate and ketone functional groups

Answer 4

Fehling’s solutiono

Question 5

Uses of fehling’s solution

Answer 5

• differentiate water-soluble carbohydrate from ketone functional groups
• test for monosaccharides

Question 6

Color of final fehling’s solution

Answer 6

Deep blue

Question 7

Two solutions of fehling’s solution:

Answer 7

• fehling’s a : blue aqueous solution of copper (ii) sulfate

* fehling’s b : colorless aqueous solution of potassium sodium tartrate (rochelle salt) and a strong alkali

Question 8

Analytical reagent used to detect the presence of soluble proteins

Answer 8

Millon’s reagent

Question 9

Positive result of presence of tyrosine (millon’s reagent)

Answer 9

Reddish-brown

Question 10

A chemical reagent used to determine the presence of an aldhyde or alpha-hydroxy ketone functional groups

Answer 10

Tollen’s reagent

Question 11

Composition of tollen’s reagent

Answer 11

• silver nitrate

* ammonia

Question 12

Positive test of tollen’s reagent

Answer 12

Precipitation of elemental silver forming a silver mirror

Question 13

Used to detect ammonia or primary and secondary amines

Answer 13

Ninhydrin

Question 14

Positive test of ninhydrin

Answer 14

Deep blue or purple color - Ruhemann’s purple

Question 15

Uses of ninhydrin

Answer 15

• detect fingerprints - terminal amines

* detect ammonia or primary and secondary amines

Question 16

Used for detecting the presence of peptide bonds

Answer 16

Biuret reagent

Question 17

Positive test in biuret reagent

Answer 17

Copper (ii) ions form a violet- colored coordination complexes in an alkaline solution

Question 18

Chemical test that distinguishes aldose between ketose sugars

Answer 18

Seliwanoff’s test

Question 19

Positive test in seliwanoff’s test

Answer 19

• deep cherry red - dehydrated ketose

* faint pink - aldose

Question 20

Used to detect the presence of reducing sugars

Answer 20

Benedict’s reagent

Question 21

Positive test for benedicts reagent

Answer 21

Color change of clear blue to brick red

Question 22

Uses of benedicts reagent:

Answer 22

• detect presence of reducing sugars

* includes monosaccharides and many disaccharides including lactose and maltose

Question 23

Common lab method of quantitative chemical analysis that is used to determine the unknown concentration of an identified analyte

Answer 23

Titration

Question 24

Other names of titration

Answer 24

* Volumetric analysis | * titrimetry

Question 25

Play a key role in titration

Answer 25

Volumetric measurements

Question 26

Reagent prepared as a standard solution

Answer 26

Titrant

Question 27

Other name for titrant

Answer 27

Titrator

Question 28

Other name of analyte

Answer 28

Titrand

Question 29

Volume of titrant reacted

Answer 29

Titre

Question 30

Titration set up

Answer 30

Beaker or erlenmeyer flask | Burette

Question 31

Equal volume of acid and base

Answer 31

Equivalence point

Question 32

Used in acid-base titrations

Answer 32

Phenolphthalein

Question 33

In acidic solutions, phenolphthalein is

Answer 33

Colorless

Question 34

In basic solution, phenolphthalein is

Answer 34

Pink

Question 35

Ph indicator for weak acids and bases

Answer 35

Bromothymol blue

Question 36

bromothymol blue turns _______ in acidic solution

Answer 36

Green to yellow

Question 37

Bromthymolblue turns _______ in basic solution

Answer 37

Blue

Question 38

Frequently used in titrations because of its clear and distinct color change

Answer 38

Methyl orange

Question 39

Color change of methyl orange when solution becomes less acidic

Answer 39

Red-orange-yellow

Question 40

In an acid, methyl orange is

Answer 40

Red

Question 41

In a base, methyl orange is

Answer 41

Yellow

Question 42

Used to calculate an unknown concentration of acid (or alkali) using a neutralization reaction

Answer 42

Titration experiment

Question 43

Number of moles =

Answer 43

Concentration of base x volume of base

Question 44

Concentration =

Answer 44

Number of moles / volume of acid

Question 45

Titration is a common lab method of quantitative chemical analysis used to determine the unknown concentration of an identified ________

Answer 45

Analyte

Question 46

A known concentration and volume of titrant reacts with a solution of ________ to determine concentration

Answer 46

Analyte or titrand

Question 47

Small volumes of the titrant are then added to the _______ and _______ until the ________ changes color in reaction to the ___________________ reflecting arrival at the endpoint of the titration

Answer 47

* analyte and indicator * indicator * titrant saturation threshold * endpoint

Question 48

Upon reaching an endpoint the volume of _______ consumed is measured and used to _______ the concentration of analyte

Answer 48

* reactant | * calculate