Give the full name of D.D.T

Dichloro diphenyl trichloro ethane

Give the approximate normality of hydrochloric acid

11.3

Formic Acid Purity

AIM:

To determine the purity of given sample of formic acid.

APPARATUS:

• 50ml erlenmeyer flask
• Electronic balance
• 500ml beaker
• Burette
  

REQUIREMENTS:

• Formic acid sample
• Distilled water
• Phenolphthalein indicator
• 1N NaOH solution
  

PROCEDURE:

• Shake the given sample of formic acid.
• Transfer 20 ml to an erlenmeyer flask provided with a stopper.

• Transfer 1-2 gm of the sample to 300ml distilled water taken in a 500ml beaker containing 2 or 3 drops of phenolphthalein indicator.



• Note the weight taken.



• Titrate the contents in the beaker against 1N NaOH solution from the burette.

CALCULATION PART:
From the weight of sample taken, volume of NaOH & normality of NaOH , the purity of formic acid can be calculated.

Lauric Acid Purity

AIM:

To determine the purity of given sample of lauric acid.

APPARATUS:

• Electronic balance
• 500ml conical flask : 2
• Water bath
• Dropper
• Burette
  

REQUIREMENTS:

• lauric acid sample
• Ethanol
• Phenolphthalein
• 0.1 N NaOH

PROCEDURE:

• Weigh 1gm of lauric acid sample using an electronic balance.
• Note the weight taken.
• Add the weighed lauric acid sample to a 500ml conical flask.
• Add 50ml ethanol to the conical flask.
• Heat the conical flask on a water bath till the contents dissolve.
• Cool for a while.
• Add 1 drop of phenolphthalein to the conical flask .
• Titrate against 0.1 N NaOH from the burette.
• A blank is also conducted.
  

CALCULATION:

From the weight of lauric acid taken, volume of NaOH & normality of NaOH, the purity of lauric acid can be calculated.

General chemistry questions- Part 2

• What is the chemical name for brimstone : sulphur
• Give the chemical name for quick silver: mercury
• What is grape sugar : dextrose
• Name the fruit sugar : fructose
• Write the chemical name for cinnabar :Mercuric Sulphide
• Write the chemical name for nitre : Potassium nitrate
• What is the chemical name for chile saltpetre : Sodium nitrate

General chemistry questions- Part 1

• Give the common name for nitric acid :Aqua fortis
• Give the chemical name for Muriatic acid : Hydrochloric acid
• Give the chemical name for oil of vitriol : Sulphuric acid
• Give the chemical name for vinegar : Dilute acetic acid
• Give the chemical name for aqua regia: Mixture of con nitric acid & con hydrochloric acid in the ratio 1:3

Interesting chemistry questions

• Name the pure acid of vinegar : Acetic acid
• Which is the smallest part of an element capable of taking part in a chemical reaction : Atom
• Common name for substances having both acidic & basic properties : Amphoteric
• Give an eg. for amphoteric substances : alumina
• Another name for methyl alcohol : Wood alcohol
• Common form of alum: Potash alum
• Name an inert chemical element used in light bulbs: Argon