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AnaChem LAB > Finals Prt. 1 > Flashcards

Finals Prt. 1 Flashcards

1
Q

T or F| Titration is faster than gravimetric

A

True

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2
Q

T or F| Gravimetric has less errors/ sacrifice in accuracy and precision than Titration (Volumetric)

A

False - Mas daghan errors sa Gravi

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3
Q

T or F| Titration is more expensive than Gravimetric

A

False - it is less expensive because it uses little materials

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4
Q

definit, reproducible relationship exists between the reacting substances.

A

Stoichiometric

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5
Q

A reaction that goes to completion when an amount of titrant equivalent to the amount of analyte present is added.

A

Quantitative

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6
Q

Why is titration fast? Slow reactions are not suitable in titration because?

A

It is difficult to estimate the equivalence point same as when reaction don’t proceed to completion.

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7
Q

Pregnancy Testing (Quanti or Quali)

A

Quanti - applies titration to a blood sample to measure the specific amount of hCG present in the blood.

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8
Q

Blood Sugar Testing (Quanti or Quali?)

A

Quanti - measure the amount of glucose in their blood by using a small portable machine called a blood glucose meter.

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9
Q

Aquarium Water Testing (Quanti or Quali?)

A

Quanti- monitor changes in water conditions, home test kits are sold containing chemicals to test the pH level of water

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10
Q

Pharmacists use ______ to achieve a desired mix of compound drugs.

A

titration

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11
Q

Doctors will often employ ______ to determine the correct proportion of different medicines in an intravenous drip.

A

titration

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12
Q

Titration is used in the food industry.

● to test free ________ content, _________ and trace amounts of water.

● to determine the estimated chain length of _______ in a fat.

A

fatty acid, unsaturated fatty acids

fatty acids

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13
Q

Titration is used in the food industry.

to test for the amount of _____ or _____, and the concentration of vitamin ___ or ____, in a product

A

salt or sugar

C or E

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14
Q

Titration is used in the food industry.

to test the product’s readiness for consumption in _____ and ______production.

A

wine and cheese

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15
Q

Titration can be employed in biology labs, where it is used to determine the proper concentration of chemicals to _________ test animals.

A

anesthetize

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16
Q

reaction occurs when equimolar solutions of acids and bases react and create a neutral solution.

A

neutralization

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17
Q

_________ neutralize excess ________ to form water and magnesium

A

Hydroxide ions (OH-) / hydrogen ions (H+)

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18
Q

• Is the solution added from the burette.

A

TITRANT

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19
Q

Its concentration is known

A

TITRANT

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20
Q

• Is the sample to be titrated.

A

ANALYTE

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21
Q

It has an unknown concentration.

A

ANALYTE

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22
Q

• Is the point at which the amount of acid and base present exactly neutralizes one another.

A

EQUIVALENCE POINT

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23
Q

• Is a substance that is generally added to the solution in the receiving vessel an which undergoes some sort of color change when reaction is over.

A

INDICATOR

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24
Q

• Is the point when the indicator changes color.

A

END POINT OF TITRATION

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25
Q

The _____________ on a titration curve is whe the moles of acid are equal to the moles of base.

A

equivalence point

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26
Q

When the equivalence point is reached the reaction is called

A

neutralization reaction

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27
Q

3 TYPES OF ACID-BASE TITRATION

A

Strong Acid-Strong Base Titration
Strong Acid-Weak Base Titration
Weak Acid-Strong Base Titration

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28
Q

: When sample is an acid

A

Acidimetry

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29
Q

: When sample is a base

A

Alkalimetry

30
Q
  • is the center of all titrations and it should be standardized first before you will use it, thus the name standard solution
A

Titrant

31
Q

PROPERTIES of titrant

A

o Be sufficiently stable
o React rapidly to the analyte
o React more or less completely with the analyte
o Undergo a selective reaction with the analyte

32
Q
  • acid titrant most commonly used
A

HYDROCHLORIC ACID

33
Q

Why is HCl commonly used as a titrant?

A

Advantages:

• it is a strong acid
• dilute solutions are very stable
• very little oxidizing and reducing power
• chloride ions do from precipitates with other cations

34
Q

T or F| chloride ions from precipitates with other cations

A

True

35
Q

Commonly used acid titrants

A

HYDROCHLORIC ACID
DILUTE SOLUTIONS OF PERCHLORIC ACID
DILUTE SOLUTIONS OF SULFURIC ACID

36
Q

o contains secondary hydrogen
o forms insoluble sulfates with other common cations

A

DILUTE SOLUTIONS OF SULFURIC ACID

37
Q

There are no available primary grade reagents for _____ titrants and therefore must be standardized

A

base titrants

38
Q

Why must base titrants be standardized?

A

Because there are no available primary grade reagents for base titrants

39
Q

Common base titrants

A

NaOH
KOH

40
Q
  • used almost exclusively for titrating acids in aq. Soln
A

NaOH

41
Q
  • as substitute for NaOH
A

KOH

42
Q

is a highly purified compound that serves as a reference material in titrations and in other analytical methods.

A

Primary Standard

43
Q

Important requirements for primary standard;

A

o High purity
o Atmospheric stability
o Absence of hydrate water
o Modest cost
o Reasonable solubility
o Reasonably large molar mass

44
Q

PRIMARY STANDARDS FOR ACIDS

A

Sodium carbonate, Na2CO3

Sodium tetraborate, Na2B4O 710 H2O

45
Q

Commonly used for standardizing acid solution

A

Sodium Carbonate

46
Q

PRIMARY STANDARDS FOR BASE

A

Potassium hydrogen phthalate, KHC8H4O4
Sulfamic acid, H ₂ NSO ₂ H
Tris(hydroxymethyl)aminomethane, (HOCH2)3CNH2

47
Q

Are substances whose solutions change color due to changes in pH.

A

Indicators

48
Q

________ indicators are usually compounds of complex structure, and like a dyestuff in character. They are usually either weak acids or weak bases.

A

Acidimetric

49
Q

Indicators that are commonly used in acid-base titration are (3)

A

methyl orange
methyl red
phenolphthalein

50
Q

Methyl Orange

A

3.0 - 4.4

51
Q

Phenolphthalein

A

8.2 - 10.0

52
Q

CHOOSING THE SUITABLE INDICATOR

This choice ensures that the pH at the __________ will fall within the range over which indicator changes color

A

equivalent point

53
Q

pH RANGES FOR INDICATOR:

Strong Acid-Strong Base
-End Point pH Range
-Suitable indicator

A

3-10
Any Indicator

54
Q

pH RANGES FOR INDICATOR:

Weak Acid-Strong Base
-End Point pH Range
-Suitable indicator

A

7-11
Phenolphthalein, thymol blue (8.0-9.6)

55
Q

pH RANGES FOR INDICATOR:

Strong Acid-weak Base
-End Point pH Range
-Suitable indicator

A

3-7
Methyl orange, methyl red

56
Q

pH RANGES FOR INDICATOR:

Weak Acid-Weak Base
-End Point pH Range
-Suitable indicator

A

None

57
Q

can be used to monitor the pH during the titration instead of relying solely on indicators.

A

pH meters or pH electrodes

58
Q

This provides more accurate and precise measurements of pH throughout the titration process.

A

pH meters or pH electrodes

59
Q

pH at equivalence point in all strong acid-strong base titrations falls to ___ which is neutral.

A

7

60
Q

pH at equivalence point of the titration of strong acids-bases is constant at __, you may choose an indicator that changes its color on pH __ like methyl orange, phenolphthalein, or thymol blue.

A

7

61
Q

indicators that changes its color on pH 7 like

A

methyl orange
phenolphthalein
thymol blue.

62
Q

METHYL ORANGE:
______ in base
______ in acid
endpoint is _____ to _____

A

yellow

red

peach to orange

63
Q

PHENOLPHTHALEIN:
_____in base
_______ in acid
endpoint is ___________

A

fuchsia

colorless

very light pink

64
Q

is preferred for cleaning burettes due to its purity, minimal residue, prevention of reactions, consistency, and promotion of accuracy and precision. It ensures that the burette remains clean, free from contaminants, and in optimal condition for accurate measurements in subsequent experiments or titrations.

A

distilled water

65
Q

is used to accurately measure and dispense the titrant (the solution of known concentration) into the analyte solution during the titration.

A

Burette

66
Q

is used to hold the burette in a vertical position during the titration. It ensures stability and allows for easy control and adjustment of the burette height.

A

burette stand or clamp

67
Q

is a glass container that holds the analyte solution, the substance whose concentration is being determined.

A

titration flask

68
Q

is a substance that undergoes a color change or other noticeable change at or near the endpoint of the titration.

A

indicator

69
Q

helps in visually detecting the completion of the reaction between the analyte and the titrant.

A

indicator

70
Q

allows for precise control of the flow rate of the titrant from the burette into the titration flask.

A

burette tip or stopcock

AnaChem LAB (19 decks)

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