To analyse the given sample of salt for detection of one acidic and one basic radical

Aim: - To analyse the given sample of salt for detection of one acidic and one basic radical

Observation table-

A) Detection of acidic  radical(anion)

S.N.	EXPERIMENT	OBSERVATION	INFERENCE
1	Salt + Dil. H2SO4 and warm solution	Colourless gas with vinegar like smell evolves	Acetate (CH3COO-) may be present
2.	Confirmatory test for Acetate: (a)  Oxalic acid test: take 1 g of salt in test tube and add small amount of oxalic acid + one -two drops of distilled water   (b)  Ferric Chloride test: take 1 g of salt in test tube and add 1-2 ml distilled water , shake well and add 1-2 ml of neutral ferric chloride solution to it	Smell of vinegar obtained       Deep red color appears	Acetate (CH3COO-) is confirmed       Acetate (CH3COO-) is confirmed

 

Detection of basic radical(cation)

S.N.	EXPERIMENT	OBSERVATION	INFERENCE
1	Salt + NaOH solution + heat	No gas evolve	Zero group is absent
2.	Prepare original solution of salt by dissolving in 20 ml of water	Cleat solution is formed	Water soluble salt is present
3.	Small amount of OS + Dil. HCl solution	White precipitate is formed	Group -I is present Pb2+ may be present
4.	Confirmatory test of Pb2+: dissolve the precipitate in hot water and divide it into three parts (a)  part -1 + KI solution (b)  part-2 + potassium chromate   (c)  part-3 + few drops of alcohol + dil. H2SO4	Yellow precipitate  yellow precipitate is obtained which is soluble in NaOH  White precipitate is obtained which is soluble in ammonium acetate	Pb2+ is confirmed  Pb2+is confirmed   Pb2+ is confirmed

Result: in given sample of salt on acidic radical acetate (CH3COO^-) and one basic radical lead (Pb²⁺) is present. 

To analyse the given sample of salt for detection of one acidic and one basic radical

Aim: - To analyse the given sample of salt for detection of one acidic and one basic radical

Observation table-

A) Detection of acidic  radical(anion)

S.N.	EXPERIMENT	OBSERVATION	INFERENCE
1	Salt + Dil. H2SO4	No gas evolves	SO44-group is absent
2.	Salt + Con. H2SO4	Colourless gas with pungent smell evolves	Chloride (Cl-) may be present
3.	Confirmatory test for chloride: (a)  Salt + Dil. HNO3 + AgNO3 solution   (b)  Chromyl  chloride test:- ·      Salt + K2Cr2O7 + Conc. H2SO4 + warm   ·      Pass the vapours through NaOH solution ·      Add lead acetate and dil. Acetic acid to yellow solution
		White ppt soluble in	Chloride (Cl-) is
		ammonia solution	confirmed
		Red colour vapors evolves	Chloride (Cl-) may be
		Solution turns
		yellow	Chloride (Cl-) is
		Yellow precipitate is	confirmed
		formed

 

Detection of basic radical(cation)

S.N.	EXPERIMENT	OBSERVATION	INFERENCE
1	Salt + NaOH solution + heat	Colourless gas with ammonical smell evolves	Zero group is present NH4+ may be present
2.	Confirmatory test of  NH4+ :- (a)  put glass rod dipped in conc. HCl acid on the mouth of test tube (b)  Salt + conc. NaOH + Nessler reagent + Warm	Dense white fumes generate around glass rod Brown solution	NH4+ may be Confirmed  NH4+  is Confirmed

Result: in given sample of salt on acidic radical chloride (Cl^-) and one basic radical ammonium (NH4+) are present.

To study proteins from sample and detect their presence in food sample

Aim: To study proteins from sample and detect their presence in food sample. 

Material required: Test-tube, test-tube stand, test tube holder, glass rod, burner etc.

Theory: Proteins are high molecular mass, long chain polymers composed of a amino acid. Amino acids are molecule that have both -NH2 and –COOH group.

 

S.N.	EXPERIMENT	OBSERVATION	INFERENCE
1.	Biuret test: Sample + NaOH + Dil. CuSO4 solution	Bluish violet colour appears	Protein is present
2.	Xanthoprotein test: Sample + few drops of conc. HNO3 + D	Yellow ppt.	Protein is present
3.	Million’s test: Sample + 2 drops of millions reagent + D	White ppt which changes to brick red on boiling	Protein is present
4.	Ninhydrin test: Protein sample + Few drops of ninhydrin solution + Boil the contents for 1 minute	Blue colour appear	Protein is present

 

Result: Protein is present in given sample of food.

To study fat in pure form and to detect into presence in given food sample

Aim: To study fat in pure form and to detect into presence in given food sample 

Material required: Test-tube, test-tube stand, test tube holder, burner etc.

Theory: Fats and oil are esters of long chain fatty acids and glycerol and thus also called glycerides. Fats contains saturated fatty acids while oil contain unsaturated fatty acids.

 Observation Table-

S.N.	EXPERIMENT	OBSERVATION	INFERENCE
1.	Spot test: put a small amount of sample on a filter paper and press with another filter paper	Translucent spot appears on filter paper	Fat is present
2.	Acrolein test: Take a few drops of sample in a test tube. Add few drops of potassium bisulphite to it and Heat.	Irritating smell appears due to the form of acrolein vapours.	Fat is present
3.	Solubility test: Take a small amount of sample in 3 test tubes. Add water, alcohol, and chloroform in 1, 2, 3 test tube respectively.	Sample does not dissolve in H2O but is soluble in alcohol on heating and soluble in chloroform.	Fat is present

 

Result: Fat is present in given sample of food.

To study carbohydrates in pure form of detect its presence in food

Aim: To study carbohydrates in pure form of detect its presence in food. 

Material required: Test-tube, test-tube stand, test tube holder, burner etc.

Theory: Carbohydrates are Polyhydroxy aldehydes or polyhydroxy ketones, their derivatives and the substance which yield them on hydrolysis carbohydrates are classified as sugars and non-sugars. Sugars like glucose, fructose and cane sugar are crystalline.

Among sugars, glucose, fructose, and lactose are reducing while sucrose is non reducing sugar.

 

S.N.	EXPERIMENT	OBSERVATION	INFERENCE
1.	Conc. H2SO4 test: Sample + Conc. H2SO4 + Heat	Charring with burnt sugar smell.	Carbohydrates present.
2.	Fehling solution test: Sample solution + 1 ml of Fehling A + 1 ml of Fehling B + D	Red ppt	Reducing sugar is present
3.	Tollen’s reagent: Aq. Solution of sample + 2 ml of Tollens reagent + D	Silver mirror is formed along the surface of test tube.	Reducing sugar is present
4.	Benedict’s Solution test: Aq solution of sample + Benedict’s reagent + Heat	Red ppt	Reducing sugar is present
5.	Iodine test: Sample Solution + few drops of iodine solution	Violet colour	Starch is present

 

Result : Carbohydrates is present in given sample of food.