WEEK 7: Acidimetry

Question 1

The analysis of a base using an accurately measured volume of standard acid solution.

Answer 1

Acidimetry

Question 2

________ if using an accurately measured volume of a standard acid solution.

Answer 2

DIRECT

Question 3

DIRECT if using an accurately measured volume of a _________________.

Answer 3

standard acid solution

Question 4

__________ if the process requires adding an excess of the standard acid solution and determining the amount in excess by residual titration with standard alkali solution.

Answer 4

RESIDUAL

Question 5

Assay of Sodium Bicarbonate - DIRECT ACIDIMETRIC ASSAY

Answer 5

3 g of NaHCO3 dissolved in 25 ml of water

Add the indicator

Titrate with 1 N Sulfuric acid

Question 6

Assay of Zinc Oxide - RESIDUAL ACIDIMETRIC ASSAY

Answer 6

accurately weighed sample of zinc oxide

add ammonium chloride

dissolved in 50 mL of 1-N sulfuric acid

Indicator is added

excess acid is titrated with sodium hydroxide until the endpoint is reached.

Calculate the percentage purity of zinc oxide.

Question 7

A method designed to determine and quantify ammonia in ammonium sulfate obtained by, decomposing organic substance with sulfuric acid.

Answer 7

Kjeldahl Method

Question 8

These compounds serve as catalysts in Kjeldahl Method.

Answer 8

K2SO4 (Potassium Sulfate)
anhy Na2SO4 (Sodium Sulfate)
CuSO4 (CopperII Sulfate)
Se (Selenium)

Question 9

What is added if N is as NO3 in Kjeldahl Method?

Answer 9

salicylic acid

Question 10

USP Methods in Kjeldahl Method

Answer 10

Method I for macroanalysis
Method II for semi-microanalysis

Question 11

Method I in Kjeldahl Method

Answer 11

macroanalysis

Question 12

Method II in Kjeldahl Method

Answer 12

semi-microanalysis

Question 13

Kjeldahl Method is a method designed to determine and quantify __________ in __________________ obtained by decomposing organic substance with sulfuric acid

Answer 13

ammonia in ammonium sulfate

Question 14

This continues to be the gold standard for comparison with all other procedures and is widely applied internationally.

Answer 14

Kjeldahl Method

Question 15

It has become a key method for estimating the amount of protein in foods due to its universality, high precision, and good reproducibility.

Answer 15

Kjeldahl Method

Question 16

Kjeldahl method is not appropriate for compounds with ______________________________ because the Kjeldahl process cannot be used in these situations to turn the nitrogen into ammonium sulphate.

Answer 16

nitrogen in azo and nitro groups or in rings (quinoline, pyridine, etc.)

Question 17

The total nitrogen present in organic substances is widely renowned as ?

Answer 17

total Kjeldahl nitrogen

Question 18

It is majorly utilized in sewage treatment plants, treat ment of industrial effluent as it is considered as an useful tool in the chemical analysis of soil water or wastewater.

Answer 18

Total Kjeldahl Nitrogen

Question 19

This method is well accepted globally for its accuracy, versatility and efficient strategy.

Answer 19

Total Kjeldahl Nitrogen