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PHAN 1 LEC > WEEK 7: Acidimetry > Flashcards

WEEK 7: Acidimetry Flashcards

1
Q

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

A

Acidimetry

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2
Q

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

A

DIRECT

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3
Q

DIRECT if using an accurately measured volume of a _________________.

A

standard acid solution

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4
Q

__________ 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.

A

RESIDUAL

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5
Q

Assay of Sodium Bicarbonate - DIRECT ACIDIMETRIC ASSAY

A

3 g of NaHCO3 dissolved in 25 ml of water

Add the indicator

Titrate with 1 N Sulfuric acid

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6
Q

Assay of Zinc Oxide - RESIDUAL ACIDIMETRIC ASSAY

A

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.

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7
Q

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

A

Kjeldahl Method

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8
Q

These compounds serve as catalysts in Kjeldahl Method.

A

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

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9
Q

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

A

salicylic acid

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10
Q

USP Methods in Kjeldahl Method

A

Method I for macroanalysis
Method II for semi-microanalysis

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11
Q

Method I in Kjeldahl Method

A

macroanalysis

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12
Q

Method II in Kjeldahl Method

A

semi-microanalysis

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13
Q

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

A

ammonia in ammonium sulfate

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14
Q

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

A

Kjeldahl Method

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15
Q

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

A

Kjeldahl Method

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16
Q

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.

A

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

17
Q

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

A

total Kjeldahl nitrogen

18
Q

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.

A

Total Kjeldahl Nitrogen

19
Q

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

A

Total Kjeldahl Nitrogen

PHAN 1 LEC (14 decks)

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