With the use of a labelled diagram, describe how grease can be removed from fabric using soap. (3 marks)
→ Soap molecules, as shown in the diagram, have a negatively charged (hydrophilic) “head” and a hydrophobic ‘tail’ consisting made up of fatty acids.
→ Hydrophobic tails are attracted to the grease particles and attach themselves.
→ The hydrophilic heads, at the same time, are attracted to water molecules. This chain of attractions will lift grease off the fabric and suspend it in the water.
→ Soap molecules, as shown in the diagram, have a negatively charged (hydrophilic) “head” and a hydrophobic ‘tail’ consisting made up of fatty acids.
→ Hydrophobic tails are attracted to the grease particles and attach themselves.
→ The hydrophilic heads, at the same time, are attracted to water molecules. This chain of attractions will lift grease off the fabric and suspend it in the water.