6. When soap is added to hard water, more is usually need to form a lather than would be required with soft water
True
False
7. This is because...?
a 'scum' is not produced, which makes it harder to form a lather
the calcium and/or magnesium ions in hard water react with soap
none of the soap is used up in the reaction and forms insoluble salts
8. Why is it better to use soapless detergents instead of soap in hard water areas?
the do not react with ions in hard water
'scum' is produced
it works faster
9. Why is it better to use soapless detergents instead of soap in hard water areas?
no 'scum' is produced
less harsh to the skin
environmentally friendly
10. Is this statment: 'they are not designed to be used for a variety of conditions' a reason why it is better to use soapless detergents in hard water?
False
True
11. Is this statment: 'they contain one or more surfactant, which means that there will always be a foam to clean with' a reason why it is better to use soapless detergents in hard water?
