Question

soap forms scum with following salts
A. Mgcl2

B. NaCl

C. NaCO3

D. NaHCO3​

Answer 1

Answer:

Water is nature’s most wonderful, abundant and useful compound. Water is not only essential for

the lives of animals and plants, but also occupies a unique position in industries. It is widely used in

drinking, bathing, sanitary, washing, irrigation, fire-fights, air-conditioning and also production of

industrial materials. The distribution of water on the Earth’s surface is extremely uneven. Only 3% Of

freshwater (69% resides in glaciers, 30% underground, and less than 1% is located in lakes, rivers and

swamps.) of water on the surface is fresh; the remaining 97% resides in the ocean. Looked at another

way, only one percent of the water on the Earth’s surface is usable by humans, and 99% of the usable

quantity is situated underground.

Answer 2

Answer:

The correct option is (a). The soap forms scum with the $MgCl_{2}$ salt.

Explanation:

Water is assessed as water when the concentration of certain ions like $Ca^{2+}$and $Mg^{2+$ exceeds a particular limit. water has high mineral content, this is often caused thanks to the percolation of water through certain ores like gypsum, limestone, and chalk that are largely made of calcium and magnesium carbonates, bicarbonates, and sulphates. Soaps are basically sodium and potassium salts of long-chain fatty acids; these salts help with the cleansing and emulsifying action that's required for cleaning purposes and therefore the formation of froth. When soap is dissolved in water, it reacts with the calcium and magnesium ions that are present there and form calcium and magnesium salt of fatty acids. These salts aren't miscible in water in any respect and form a white layer on the surface of the water called scum. This scum prevents the foaming action and thus cleaning, inhibiting the function of soap.

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