Acid-Base Titrations And Neutralization Methods

Question 1

It is based on a reaction between an analyte and a standard solution called titrant.

Answer 1

Titration

Question 2

An ultra pure reagent where the solution of unknown concentration is compared to.

Answer 2

Titrant

Question 3

Common primary standard for NaOH

Answer 3

Potassium Hydrogen Phthalate (KHP)
KHC8H4O4

Question 4

The _____ of a titration is based upon experimental observation, whereas the ____ is the theoretical point reached when the amount of titrant is equivalent to amount of analyte present

Answer 4

End point, equivalence point

Question 5

KHP is a weak monoprotic acid, white, soluble solid that is commercially available in highly pure form.

Answer 5

True

Question 6

Used to observe the end point during titration

Answer 6

Indicator

Question 7

Common indicator in acid-base titrations which turns pink when the solution becomes basic

Answer 7

Phenolphthalein

Question 8

Measure of the acid -neutralizing capacity of a water sample

Answer 8

Alkalinity

Question 9

When sources of alkalinity are limited to carbonates (OH-, HCO3-, CO32-), _____are often employed

Answer 9

Double indicator titrations

Question 10

Titrations at pH ___ (bromocresol green endpoint) and pH ___ (phenolphthalein end point) can be used to determine which species are present, and their respective co centrations

Answer 10

4.5, 8.3

Question 11

What are the constituents of the sample if Vphth=Vbcg

Answer 11

OH-

Question 12

Which are the limitations of the Warder method (direct titration)?

I. Diffused endpoints
II. Possible loss of CO2 from the reaction of HCO3- and acid
III. Possible small errors in calculations of OH- and CO32-

Answer 12

I and II

Question 13

____ counters the limitations of Wardnder methods

Answer 13

Wrinkler methods (indirect titrations)

Question 14

Elemental analyses are often performed with _____ as the final step

Answer 14

Acid-base titrations

Question 15

Used for nitrogen determination.

Answer 15

Kjeldahl analysis

Question 16

Used to calculate protein content of certain food samples using the %N determined. In kjeldahl method

Answer 16

Jones factor

Question 17

The identity of an unknown weak acid or weak base can be established by determining the _____ at half equivalence point and the ______ at equivalence point.

Answer 17

Ionization constant, equivalent weight

Question 18

One way to overcome wardner titration, specifically to precipitate CO32- , ______ is added leaving the other component to be titrated by standard acid.

Answer 18

BaCl2

Question 19

One way to overcome wardner titration, specifically to avoid large errors in calculations for samples containing OH- and CO32-, back titration of _______ with _______ is done.

Answer 19

Excess NaOH, standard HCl

Question 20

In what region in titration curve of weak acid/base with strong base/acid titrant does the analyte = conjugate, and pH=pKa

Answer 20

At half equivalence point

Question 21

In what region in titration curve of weak acid/base with strong base/acid titrant does the conjugate ionize?

Answer 21

At equivalence point

Question 22

What is the recommended pairing of analyte and titrant?

Answer 22

Strong acid-strong base