Question

Choose the correct statement regarding hardness of water

• A. Hard water produces lather with soap solution
• B. Soft water produce lather with soap solution
• C. Distilled water produce lather with soap solution
• D. Sea water produce lather with soap solution

Answer 1

Answer: (B), (C)

The correct options are
B Soft water produce lather with soap solution
C Distilled water produce lather with soap solution

The water with naturally present minerals like magnesium and calcium with detectable amount is called hard water. Hard water doesn't form lather with soap solution because they react with soap solution and get precipitated.

Soft water is treated water and it left with only sodium ion. Calcium and magnesium ions won't be present in the soft water hence they form lather with soap solution.

Distilled water is a treated water without any calcium and magnesium salt. Hence they will form lather with soap solution.

Salt water contain various dissolved salts includes calcium and magnesium salt. Hence they will get precipitate on reacting with salt solution. Thus it doesn't form lather.