The role of phosphate in detergent powder is to

Options

A. provide whitness to the fabric
B. remove `Ca^(2+)` and `Mg^(2+)` ions from the water that cause the hardness of water
C. Control pH level of the detergent water mixture.
D. form solid detergent as phosphate less detergent are liquid in nature.

Answer

C

Explanation

Phospheates were added to commercial detergents for various purpose. They complexed the metal inos that contributed to water hardness and kept them dissolved, controlled acidity andinfluenced mecelle formation. The eutrophication in rivers an streams that recrive sewage. This is a condition (not reated to collies) in which an overgrowth of vegetation is casued by the high concentration of phosphours, a plant nutrient. This overgrowth and the subsequent decay of the dead plants lead to decreased dissolbed `O_(2)` in the water, which causes the gradual elimination of marine life.