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PRPM141 M3

Total questions: 51

Worksheet time: 27mins

Name
Class
Date
1.

Analytical method of determining the quantity of a reagent of known concentration that is required to react completely with the amount of active constituent in the sample being analyzed.


Which statement is NOT true?

a)

This refers to TITRIMETRY

b)

Unkown concentration - Standard Solution

c)

Sample being analyzed - Analyte

d)

Known concentration - Standard Solution

2.

When we say Assay of Vinegar (Acetic Acid), we are referring to:

a)

Sample of Vinegar

b)

Analyte of Vinegar

c)

Sample of Vinegar

d)

Standard Solution of Vinegar

3.

If there is no specific indicator provider, the drops would be:

a)

2 drops

b)

4 drops

c)

3 drops

d)

1 drop

4.

In Assay of Acetic acid in Vinegar sample, what can you infer?

Which one is incorrect:

a)

If the Analyte is acid, therefore the Standard Solution must be base

b)

If the Analyte is acid, therefore the Standard Solution is also Acid

c)

Type of titrimetry is Alkalimetry

d)

The amount of analyte is equal to amount of standard solution

5.

Standard solution is usually expressed in:

a)

N or M

b)

M or L

c)

% or mL

d)

N or %

6.

Analyte is:

a)

usually in grams (mass) and the one being analyzed in the flask

b)

usually in volume (mass) and the one being analyzed in the flask

c)

usually in grams (mass) and the one being analyzed in the buret

d)

usually in mg (mass) and the one being analyzed in the flask

7.

Standard solution is:

a)

known concentration; titrand and expressed in N or %

b)

known concentration and volume; titrant and expressed in mg

c)

known concentration; titrand; and which contain in the buret

d)

known concentration; titrand; and which contains in the flask

8.

The flask contains:

a)

Indicator + Assay

b)

Solution + Assay

c)

Analyte + Stock

d)

Indicator + Analyte

9.

TITRATION: A process in which a standard reagent is

added to a solution of analyte until the

reaction is judged to be complete.

Which includes:

a)

Titrant • solution added from the buret

Titrand • substance being titrated

b)

Titrant • solution added from the buret

Titer • substance being titrated

c)

Titrand• solution added from the buret

Titrant • substance being titrated

10.

The Assay is titrated using these two that needs in the process:

a)

• Standard solution

–solution of known concentration

• Analyte

–substance in a sample being analyzed

b)

• Standard solution

–solution of known concentration

• Titrant

–substance in a sample being analyzed

c)

• Stock solution

–solution of known concentration

• Analyte

–substance in a sample being analyzed

11.

What is the difference between Assay and

Standardization?

a)

Standardization is composed of Titrant and Titrand while Assay is composed of Assay and Analyte

b)

No difference at all

c)

Standardization is composed of Titrant and Equivalent point while Assay is composed of Assay and Analyte

d)

Standardization is using secondary while Assay is using primary

12.

Determine the analyte: Paracetamol in Biogesic tablet

a)

Paracetamol

b)

Tablet

c)

Excipients

d)

Biogesic Tablet

13.

Determine the Standard Solution or Titrant: Caffeine in Coffee powder

a)

Coffee powder

b)

powder

c)

Excipients

d)

Caffeine

14.

In Calcium ions in mineral water, which is analyte and standard solution?

a)

Calcium ions: Analyte, Mineral Water: Standard Solution

b)

Calcium ions: Titrant , Mineral Water: Standard Solution

c)

Calcium ions: Analyte, Mineral Water: Stock Solution

d)

Potassium ions: Analyte, Mineral Water: Standard Solution

15.

This is refers to

Acid + Base --> Salt + Water


Which statement is incorrect?

a)

This is Neutralization, direct - Alkalimetry

b)

Cl + Na --> NaCl + H2O

c)

This is one of type of Titrimetric analysis

d)

Cl + Na --> NaCl + CO2

16.

Which one is true about KNOWN and UNKOWN:

a)

KNOWN - *N → Normality, a unit of concentration

UNKNOWN - Content/purity not yet determined

b)

KNOWN - *M → Molarity, a unit of concentration

UNKNOWN - Content/purity not yet determined

c)

KNOWN - *M → Molarity, a unit of concentration

UNKNOWN - Content/purity is determined

17.

Assay Vs. Standardization

a)

Assay - Titrant;Standard Solution - Titrand; Analyte

Standardization - Titrant ; Stock Solution - Titrand; Primary Standard

b)

Assay - Titrant;Standard Solution - Titrand; Analyte

Standardization - Titrant ; Stock Solution - Titrand; Secondary Standard

18.

During ASSAY…

• The standard solution is considered as the ___________; while the analyte/sample as the __________

a)

Titrant, Titrand

b)

Titrated, Titrand

c)

Titrand, Titrant

19.

In order to determine the concentration of the analyte, Standard solution must be tritated against____

a)

Primary standard - e.g. Sodium Carbonate

b)

Secondary standard - e.g. Sulfuric Acid

c)

Primary standard - e.g. Hydrochloric Acid

d)

Secondary standard - e.g. Sodium Chloride

20.

Equivalence Point: Which one is incorrect

a)

The acidic analyte sample requires 10 mL of Sodium Hydroxide to reach the methyl yellow

b)

When the amount of added titrant is chemically equivalent to the amount of analyte in the sample

c)

When the titrant (basic) is reacted with titrand (acidic) with the use of phenolphthalein indicator it produces a pink solution

21.

In indicators, Acid base indicators are mostly complex organic molecules which are ______

a)

either weak acid or weak bases. (Formic acid or Hydrofluoric)

b)

either strong acid or strong bases. (Hydrochloric acid or Sodium hydroxide)

22.

Added to the analyte solution to give an observable physical change.

(a)  

23.

The indicator methyl violet, is called "violet" because?

EXCEPT for Alzarin yellow.

a)

When the solution is base it turns to violet in appearance.

b)

When the solution is acid it turns to violet in appearance.

c)

When the solution is neutral it turns to violet in appearance.

24.

Two (2) drops:

Strong Acid (titrant) + Strong Base (titrand)

Inidicator is _______

a)

MO, MR, PP

b)

PP

c)

N/A

d)

MO/MR

25.

Two (2) drops:

Strong Base (titrant) + Weak Acid (titrand)

Inidicator is _______

a)

MO, MR, PP

b)

PP

c)

N/A

d)

MO/MR

26.

Two (2) drops:

Strong Acid (titrant) + Weak Base (titrand)

Inidicator is _______

a)

MO, MR, PP

b)

PP

c)

N/A

d)

MO/MR

27.

Two (2) drops:

Weak Acid (titrant) + Weak Base (titrand)

Inidicator is _______

a)

MO, MR, PP

b)

PP

c)

N/A

d)

MO/MR

28.

Two (2) drops:

CH3COOH (titrant) + H2S (titrand)

Inidicator is _______

a)

MO, MR, PP

b)

PP

c)

N/A

d)

MO/MR

29.

Two (2) drops:

NaOH (titrant) + HCOOH (titrand)

Inidicator is _______

a)

MO, MR, PP

b)

PP

c)

N/A

d)

MO/MR

30.

Two (2) drops:

HNO3 (titrant) + H2S (titrand)

Inidicator is _______

a)

MO, MR, PP

b)

PP

c)

N/A

d)

MO/MR

31.

Two (2) drops:

HCl (titrant) + NaOH (titrand)

Inidicator is _______

a)

MO, MR, PP

b)

PP

c)

N/A

d)

MO/MR

32.

Primary Standard: highly purified compound

that serves a reference material, EXCEPT:

a)

High purity & High MW

b)

Stable

c)

Modest cost

d)

Soluble in medium

e)

Insoluble in medium

33.

An ideal standard solution should be; except:

a)

Stable

b)

Reacts rapidly

c)

Reacts completely

d)

Selective

e)

Objective

34.

DIRECT TITRATION: Except for one:

a)

Titrant is added to analyte until a reaction goes to completion

b)

1 Titrant only

c)

An example is Standardization or Assay

d)

Either be Acidimetry or alkalimetry

e)

An example is determining the Standard solution

35.

ACIDIMETRY: Except for one:

a)

Analysis of bases (analyte) using an accurately measured volume of acid (standard solution)

b)

Titrating Hydrochloric acid against Sodium Hydroxide analyte

c)

Standard Solution: Formic acid

Primary Standard: Sodium Chloride

d)

Titrating Sodium carbonate against Sodium Hydroxide analyte

36.

ALKALIMETRY: Except for one:

a)

Analysis of acids (analyte) using an accurately measured volume of base (standard solution)

b)

Titrating Sodium Hydroxide against Hydrochloric acid analyte

c)

Standard Solution: Hydrogen sulfide

Primary Standard: Nitric acid

d)

Titrating Hydroflouric against Sodium Hydroxide analyte

37.

Assay of Boric acid

a)

ACIDIMETRY

b)

ALKALIMETRY

38.

Assay of NaOH

a)

ACIDIMETRY

b)

ALKALIMETRY

39.

Assay of Tartaric acid

a)

ACIDIMETRY

b)

ALKALIMETRY

40.

In standardization, you're looking for N or Normality (concentration of your primary standard) in Assay, you're looking for _____

a)

Analyte Percentage (A)

b)

Analyte Purity (%A)

c)

Analyte of Sample (g)

41.

Use RESIDUAL TITRATION if: Except for one:

a)

there is a large difference between equivalence and end points

b)

when sample is insoluble in water

c)

when reaction between the titrant and analyte is slow

d)

when sample is insoluble in analyte

42.

What type of analysis is employed in the assay of aspirin tablets? Hint: NaOH and H2SO4 standard solutions are used in the assay.

a)

Residual - Alkalimetry

b)

Residual - Acidimetry

c)

Direct - Alkalimetry

d)

Direct - Acidimetry

43.

Assay of Zinc oxide (2 standards solutions used; NaOH and H2SO4 )

a)

Residual Acidimetry

b)

Residual Alkalimetry

c)

Direct Acidimetry

d)

Direct Alkalimetry

44.



(a)  

45.

A 1.2500-g sample of zinc oxide (MW=81.38, feq=2) were treated with 50.00 mL of 1.1230 N sulfuric acid in the usual way. 27.61 mL of 0.9765 N sodium hydroxide was required in the back titration

(a)  

46.

Performed using the same quantities of the same reagents treated in the same manner, but without the analyte.

a)

BLANK TITRATION

b)

DIRECT TITRATION

c)

BACK TITRATION

47.

BLANK TITRATION

a)

Used to detect impurities

b)

The volume used in blank is subtracted from to actual volume to compensate this error.

c)

The volume used in blank is added from to actual volume to compensate this error.

d)

Used to detect the purity

48.

Analysis of bases using an accurately measured volume of acid

a)

Acidimetry

b)

Alkalimetry

c)

Argentometry

d)

Compleximetry

49.

Type of analysis where an acidic sample is treated with an excess standard base, and the unreacted base is titrated with a standard acid.

a)

. Direct Acidimetry

b)

Direct Alkalimetry

c)

Residual Acidimetry

d)

Residual Alkalimetry

50.

In the residual titration of magnesium hydroxide, which of the following solution is used as the back-titrant?

a)

Hydrochloric acid

b)

Sodium hydroxide

c)

Sulfuric acid

d)

Water

51.

A 0.1 g sample of a sodium carbonate was dissolved in 50 mL of 0.1 N HCl and boiled to eliminate CO2 . Back-titration of the excess HCl required 24 mL of 0.09 N NaOH. Identify what type of analysis is employed.

a)

Direct Acidimetry

b)

Direct Alkalimetry

c)

Residual Acidimetry

d)

Residual Alkalimetry

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