ACIDIMETRY Flashcards
Is the analysis of a base using an
accurately measured volume of standard acid
solution
Acidimetry
if using an accurately measured volume of a standard acid solution
DIRECT
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
RESIDUAL
What kind of assay is Assay of Sodium Bicarbonate
DIRECT ACIDIMETRIC ASSAY
Assay of Sodium Bicarbonate
- 3 g of NaHCO3 dissolved in 25 ml of water
- Add the indicator
- Titrate with 1 N Sulfuric
acid
mEq of NaHCO3
0.084
What kind of assay is Assay of Zinc Oxide
RESIDUAL ACIDIMETRIC ASSAY
Assay of Zinc Oxide
- 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.
mEq of ZnO
0.0407
VS for Aqueous Acidimetry
HCL & H2SO4
PRIMARY STANDARD for Aqueous Acidimetry
SODIUM CARBONATE
SECONDARY STANDARD for Aqueous Acidimetry
SODIUM HYDROXIDE
DIRECT for Aqueous Acidimetry
NaOH, NaHCO3, Na Salicylate
RESIDUAL for Aqueous Acidimetry
NH4Cl, METHENAMINE, ZnO, POTASSIUM SODIUM TARTRATE, TARTRATE
VS for Non- Aqueous Acidimetry
Perchloric acid in glacial acetic acid & Perchloric acid, HBr
PRIMARY STANDARD AND SECONDARY STANDARD for Non- Aqueous Acidimetry
POTASSIUM BIPHTHALATE
DIRECT/RESIDUAL for Non- Aqueous Acidimetry
METHACOLINE CL
mEq of Na2CO3
0.053
mEq of ZnO
0.037
mEq of SODIUM BORATE H3BO3
0.1907
A method designed to determine and quantify
ammonia in ammonium sulfate obtained by
decomposing organic substance with sulfuric acid
KJELDAHL Method
Nitrogen determination
serve as
catalysts FOR KJELDAHL METHOD
K2SO4, anhy Na2SO4, CuSO4, Se
if N is as NO3, ______ is added
salicylic acid
Phases in Kjeldahl Method
1.In order to convert the amine nitrogen in the sample to
ammonium ions, it is first digested in powerful sulfuric acid with
the assistance of a catalyst.
2.After being heated and distilled, the ammonium ions are
changed into ammonia gas. The ammonia gas is introduced into a
solution for trapping where it dissolves and reverts to an
ammonium ion,
3.Finally, a computation is conducted after titrating with a
standard solution to establish how much ammonia has been
trapped.
Advantages of Kjeldahl
Method
1.The Kjeldahl method continues to be the
gold standard for comparison with all other
procedures and is widely applied
internationally.
2.It has become a key method for estimating
the amount of protein in foods due to its
universality, high precision, and good
reproducibility
Limitations of Kjeldahl
Method
Kjeldahl method is not appropriate for
compounds with nitrogen in azo and nitro
groups or in rings (quinoline, pyridine, etc.)
because the Kjeldahl process cannot be
used in these situations to turn the
nitrogen into ammonium sulphate.
The total nitrogen present in organic substances
is widely renowned as
total Kjeldahl nitrogen
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.
Total Kjeldahl Nitrogen
This method is well accepted globally for its
accuracy, versatility and efficient strategy.
Total Kjeldahl Nitrogen
