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Chemistry > Reagents And Titration > Flashcards

Reagents And Titration Flashcards

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0
Q

Substance that is consumed during the course of the chemical reactionp

A

Reactant

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1
Q

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

A

Reagent

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2
Q

A solution of hydrogen peroxide and an iron catalyst

A

Fenton’s reagent

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3
Q

Uses of fenton’s reagent

A
  • oxidizing contaminants or waste waters

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

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4
Q

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

A

Fehling’s solutiono

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5
Q

Uses of fehling’s solution

A
  • differentiate water-soluble carbohydrate from ketone functional groups
  • test for monosaccharides
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6
Q

Color of final fehling’s solution

A

Deep blue

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7
Q

Two solutions of fehling’s solution:

A
  • 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

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8
Q

Analytical reagent used to detect the presence of soluble proteins

A

Millon’s reagent

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9
Q

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

A

Reddish-brown

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10
Q

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

A

Tollen’s reagent

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11
Q

Composition of tollen’s reagent

A
  • silver nitrate

* ammonia

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12
Q

Positive test of tollen’s reagent

A

Precipitation of elemental silver forming a silver mirror

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13
Q

Used to detect ammonia or primary and secondary amines

A

Ninhydrin

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14
Q

Positive test of ninhydrin

A

Deep blue or purple color - Ruhemann’s purple

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15
Q

Uses of ninhydrin

A
  • detect fingerprints - terminal amines

* detect ammonia or primary and secondary amines

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16
Q

Used for detecting the presence of peptide bonds

A

Biuret reagent

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17
Q

Positive test in biuret reagent

A

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

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18
Q

Chemical test that distinguishes aldose between ketose sugars

A

Seliwanoff’s test

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19
Q

Positive test in seliwanoff’s test

A
  • deep cherry red - dehydrated ketose

* faint pink - aldose

20
Q

Used to detect the presence of reducing sugars

A

Benedict’s reagent

21
Q

Positive test for benedicts reagent

A

Color change of clear blue to brick red

22
Q

Uses of benedicts reagent:

A
  • detect presence of reducing sugars

* includes monosaccharides and many disaccharides including lactose and maltose

23
Q

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

A

Titration

24
Q

Other names of titration

A
  • Volumetric analysis

* titrimetry

25
Q

Play a key role in titration

A

Volumetric measurements

26
Q

Reagent prepared as a standard solution

A

Titrant

27
Q

Other name for titrant

A

Titrator

28
Q

Other name of analyte

A

Titrand

29
Q

Volume of titrant reacted

A

Titre

30
Q

Titration set up

A

Beaker or erlenmeyer flask

Burette

31
Q

Equal volume of acid and base

A

Equivalence point

32
Q

Used in acid-base titrations

A

Phenolphthalein

33
Q

In acidic solutions, phenolphthalein is

A

Colorless

34
Q

In basic solution, phenolphthalein is

A

Pink

35
Q

Ph indicator for weak acids and bases

A

Bromothymol blue

36
Q

bromothymol blue turns _______ in acidic solution

A

Green to yellow

37
Q

Bromthymolblue turns _______ in basic solution

A

Blue

38
Q

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

A

Methyl orange

39
Q

Color change of methyl orange when solution becomes less acidic

A

Red-orange-yellow

40
Q

In an acid, methyl orange is

A

Red

41
Q

In a base, methyl orange is

A

Yellow

42
Q

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

A

Titration experiment

43
Q

Number of moles =

A

Concentration of base x volume of base

44
Q

Concentration =

A

Number of moles / volume of acid

45
Q

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

A

Analyte

46
Q

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

A

Analyte or titrand

47
Q

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

A
  • analyte and indicator
  • indicator
  • titrant saturation threshold
  • endpoint
48
Q

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

A
  • reactant

* calculate

Chemistry (2 decks)

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