(a) In a tabular form, differentiate between ethanol and ethanoic acid under the following heads
(b)Write a chemical reaction to show the dehydration of ethanol.
OR
(a)What is soap? Why are soaps not suitable for washing clothes when the water is hard?
(b)Explain the action of soap in removing an oily spot from a piece of cloth.
(a) In a tabular form, differentiate between ethanol and ethanoic acid under the following heads
(b)Write a chemical reaction to show the dehydration of ethanol.
OR
(a)What is soap? Why are soaps not suitable for washing clothes when the water is hard?
(b)Explain the action of soap in removing an oily spot from a piece of cloth.
The correct option is A Physical state
(a)
(1) Physical slateEathanol is a colourless liquidEthanoic acid is colourless with Pleasant odourpungent smelling liquid(ii) TasteEathanol is bitter to tasteEthanoic acid is sour to taste(iii) NaHCO3Eathanol does not react withWhen ethanoic acid reacts with sodium sodium BicarbonateNaHCO3 with the evolution of carbon dioxide gas.(iv) Ester testEthanol on reaction with ethanoic acidEthanoic acid on reaction with in the presence of acid forms esterethanol in the presence
(b) Ethanol undrgoes dehydration to form ethane.
2CH3CH2OHΔ−−−−−−−−→Cone H2SO42CH2=CH2+2H2O Ehanol Ethene
OR
(a) soap can be defined as a sodium or potassium salt of higher fatty acids such as oleic acid (C17H33COOH), stearic acid (C17H35COOH), palmitic acid (C15H31COOH), etc.
Soap does not work properly when the water is hard. A soap is a sodium or potassium salt of long chain fatty acids. Hard water contains salts of calcium and magnesium. When soap is added to hard water, calcium and magnesium ions present in water displace sodium or potassium ions from the soap molecules forming an insoluble substance called scum. A lot of soap is wasted in the process.
(b)Cleaning action of soaps:
The oily spot present on clothes is organic in nature and insoluble in water. Therefore, it cannot be removed by only washing with water. When soap is dissolved in water, its hydrophobic ends attach themselves to the oily spot and remove it from the cloth. Then, the molecules of soap arrange themselves in the form of micelle and trap the dirt at the centre of the cluster. These micelles remain suspended in the water. Hence, the oily spots are easily rinsed away by water.
Physical state
(a)
(1) Physical slateEathanol is a colourless liquidEthanoic acid is colourless with Pleasant odourpungent smelling liquid(ii) TasteEathanol is bitter to tasteEthanoic acid is sour to taste(iii) NaHCO3Eathanol does not react withWhen ethanoic acid reacts with sodium sodium BicarbonateNaHCO3 with the evolution of carbon dioxide gas.(iv) Ester testEthanol on reaction with ethanoic acidEthanoic acid on reaction with in the presence of acid forms esterethanol in the presence
(b) Ethanol undrgoes dehydration to form ethane.
2CH3CH2OHΔ−−−−−−−−→Cone H2SO42CH2=CH2+2H2O Ehanol Ethene
OR
(a) soap can be defined as a sodium or potassium salt of higher fatty acids such as oleic acid (C17H33COOH), stearic acid (C17H35COOH), palmitic acid (C15H31COOH), etc.
Soap does not work properly when the water is hard. A soap is a sodium or potassium salt of long chain fatty acids. Hard water contains salts of calcium and magnesium. When soap is added to hard water, calcium and magnesium ions present in water displace sodium or potassium ions from the soap molecules forming an insoluble substance called scum. A lot of soap is wasted in the process.
(b)Cleaning action of soaps:
The oily spot present on clothes is organic in nature and insoluble in water. Therefore, it cannot be removed by only washing with water. When soap is dissolved in water, its hydrophobic ends attach themselves to the oily spot and remove it from the cloth. Then, the molecules of soap arrange themselves in the form of micelle and trap the dirt at the centre of the cluster. These micelles remain suspended in the water. Hence, the oily spots are easily rinsed away by water.
