list 2 mefits and 2 demerits of using detergent for cleaning purpos.
Answers
advantages:
1.Greater cleansing efficiency is achieved with modem detergents. They do not combine with the calcium, magnesium, and other salts present in varying degrees in any water, and thus are not wasted.
2. If soap deposits have left clothes stiff and gray, a soap less detergent will remove the soapy deposits. As a result clothes feel soft and fluffy-look new again.
3. Detergents have greater efficiency against acids. They wash effectively even in an acid medium.
4. Detergents are soluble in cold water. Though family laundry is usually done in hot water. Sometimes it is desirable or necessary to wash in cool or cold water. Modem detergents dissolve the fabric rapidly and clean the clothes immediately. Detergents work effectively even in hard or cold water.
5. Rinsing may be omitted when water supply is limited if one prefers not to rinse. More than one deep, clear water rinse is unnecessary. If some amount of detergent is left on the fabric, it causes no harm to the fabric. In some detergents less amount of water is required for rinsing
disadvantages:
1. Excessive alkalies used in some detergents can damage the fabric.
2. Colour may run out while using cheaper variety of detergents.
3. More amount of water is required for rinsing to remove foam, otherwise it will damage the fabric.
4. Sometimes some detergents react in hard water with calcium, or magnesium compounds to form curds that can be re-deposited on fabric.