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Determination Of Contents Of Cold Drinks

 

 

DETERMINATION OF CONTENTS OF COLD DRINKS

 

PURPOSE

Recently, soft drink marks stayed placed on several questions concerning their reliability. Report flashed that they include toxic pesticide, which stimulates several advantages in understanding its contents because I have been taking them for years.

INTRODUCTION

Considering the outset of cold drinks was extremely successful and attracting, many multinational companies launched their brands in India like Pepsi and Coke.
Nowadays, it is observed in general that majority of people viewed Sprite, Miranda, and Limca to give a feeling of lightness, while Pepsi and Thumps Up to initiate pulse and brain.

 

THEORY

Cold drinks of different brands are made of alcohol, carbohydrates, carbon dioxide, phosphate ions etc. These soft drinks give the feeling of light, brightness and have a tangy flavor which is liked by everyone. Carbon dioxide is responsible for the development of bubble about shaking the bottle.

The carbon dioxide gas is dissolved in water to form carbonic acid which is also responsible for the tangy taste. Carbohydrates are the naturally occurring organic compounds and are a major source of energy to our body. The general formula of carbohydrates is CX (H2O)Y.

 

On the basis of their molecule size carbohydrates are classified as:-

Monosaccharide, Disaccharides, and Polysaccharides. Glucose is a monosaccharide with formula C6H12O6. It transpires in Free State in the ripen grapes in bones and also in many sweet fruits. It is widely distributed in nature in juices, seeds and also in flowers of many plants.

It is also present in human blood to the extent of about 0.1%. Sucrose is one of the most useful disaccharides in our daily life.

The main source of sucrose is sugar cane juice which contains 15-20 % sucrose and sugar beet which has about 10-17 % sucrose. The molecular formula of sucrose is C12H22O11.

It is produced by a mixture of glucose and fructose. It is non-reducing in nature whereas glucose is reducing. Cold drinks are a bit acidic in nature and their acidity can be measured by finding their pH value. The pH values also depend upon the acidic contents such as citric acid and phosphoric acid.

 

TEST FOR PH

 

EXPERIMENT

Small specimens of cold drinks of various brands were taken in a test tube and put on the pH paper. The change in the color of pH paper was noticed and was compared with the standard pH scale.

OBSERVATION

 

INFERENCE

Soft drinks are commonly acidic because of the presence of citric acid and phosphoric acid. pH values of a cold drink of different brands are different due to the variation in a number of acidic contents.

TEST FOR CARBON DIOXIDE

 

EXPERIMENT

As soon as the bottles were opened, one by one the sample was passed through lime water. The lime water turned milky.

OBSERVATION

INFERENCE

All the soft drinks contain dissolved carbon dioxide in water. The carbon dioxide (CO2) dissolves in water to form carbonic acid, which is responsible for its tangy taste.

CHEMICAL REACTION INVOLVED

Ca(OH)2(s) + CO2(g) ———– CaCO3(s) + H2O(s)

 

TEST FOR GLUCOSE

 

EXPERIMENT

Glucose is a reducing sugar acid. Its presence is detected by the following test:-

1. BENEDICTS’S REAGENT TEST:-

Small samples of cold drinks of different brands were taken in a test tube and a few drops of Benedict’s reagent were added. The test tube was heated for few seconds. Formation of reddish color confirmed the presence of glucose in cold drinks.

OBSERVATION

INFERENCE

All the samples gave a positive test for glucose with Benedict’s reagent.
Hence all the drinks contain glucose.

 

2. FEHLING’S SOLUTION TEST

Small samples of cold drinks of various marks obtained practiced in a test tube and a few drops of Fehling’s A solution and Fehling’s B solution was added in equal amount. The test tube was heated in a water bath for 10 minutes. The presence of brown precipitate established the presence of glucose in cold drinks.

OBSERVATION

INFERENCE

All the samples gave a positive test for glucose with Fehling’s (A & B) solutions. Hence all the cold drinks contain glucose.

TEST FOR PHOSPHATE

 

EXPERIMENT

Small samples of each brand of cold drinks were taken in separate test tubes and Ammonium Molybdate followed by concentrated Nitric Acid (HNO3) was added to it. The solution was heated. The appearance of canary-yellow precipitate confirmed the presence of phosphate ions in cold drinks.

OBSERVATION

INFERENCE

All the soft drinks samples gave a positive test for phosphate ions. Hence all the cold drinks contain phosphate.

CHEMICAL REACTION INVOLVED

NaHPO4 + 12(NH4)2MoO4 + 21HNO3 + 3H+ ———- (NH4)3PO4.12MoO3 + 21HN4NO3 + 12H2O

TEST FOR ALCOHOL

 

EXPERIMENT

Small samples of each label of cold drinks were brought in separate test tubes and Iodine followed by Potassium Iodide and Sodium Hydroxide (NaOH) solution was added to each test tube. Then the test tubes were heated in hot water bath for 30 minutes. Appearance of yellow colored precipitate confirmed the presence of alcohol in cold drinks

OBSERVATION

INFERENCE

All the cold drinks samples gave a positive test for alcohol. Hence all the cold drinks contain glucose.

CHEMICAL REACTION INVOLVED

CH3CH2OH + 4I2 + 6NaOH —— CHI3 + HCOONa + 5NaI + 5H2O

 

TEST FOR SUCROSE

 

EXPERIMENT

5 ml samples of each brand of cold drinks were taken in separate china dishes and were heated very strongly until changes occur. Black colored residue left confirmed the presence of sucrose in cold drinks.

OBSERVATION

INFERENCE

All the brands of cold drinks contain sucrose. But the amount of sucrose varies in each brand of drink. Fanta contains the highest amount of sucrose.

 

RESULT

After conducting several tests, it was concluded that the different brands of cold drinks namely:

1. Coca-Cola
2. Sprite
3. Limca
4. Fanta

All contain glucose, alcohol, sucrose, phosphate and carbon dioxide. All cold drinks are acidic in nature. On comparing the pH value of different brands Coca-Cola is the most acidic and Limca is least acidic of all the four brands taken.

 

DISADVANTAGES

1. Soft drinks are little more harmful than sugar solution. As they contain sugar in large amount which causes problems in diabetes patients.

2. Soft drinks can cause weight gain as they interfere with the body’s natural ability to suppress hunger feeling.

3. Soft drinks have the ability to dissolve the calcium so they are also harmful to our bones.

4. Soft drinks contain “phosphoric acid” which has a pH of 2.8. So they can dissolve a nail in about 4 days.

5. For transportation of soft drinks syrup, the commercial truck must use the hazardous matter place cards reserved for highly conceive material.

6. Obesity and weight-related diseases.

7. Soft drinks have also the ability to remove blood so they are very harmful to our body.

 

ADVANTAGES

1. They can remove rust spots from chrome car Humper.

2. They can lose a rusted bolt.

3. In many states, the highway patrol carries a few gallons of Soft Drinks in order to remove blood from the highway after auto accidents.

Place a T-bone steak in a bowl of Soft Drinks and it will be gone in 2-3 days. The meat is consumed by the acid of the cola.

5. Toilet Cleaning: Pour a can of Soft Drinks into the toilet bowl and let the “real thing” sit for one hour, then flush. It magically cleans better than if you had scrubbed it. The citric acid in Soft Drinks also removes stains from vitreous china.

6. Remove grease from clothes: Empty a can of Soft Drinks into a load of greasy clothes, add detergent, and run through a regular cycle. The Soft Drinks will help loosen grease stains. It is also an excellent cleaner road haze from your windshield.

7. The active ingredient in Soft Drinks is phosphoric acid. Its pH is 2.8. It will dissolve a nail in about 4 days.

8. Clean corrosion from car battery terminals: Pour Soft Drinks over the terminals and the ultra-acid soft drink bubble away the alkaline corrosion in seconds.

 

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