The magnesium or calcium ions present in the hard water replaces the sodium or potassium ions present in the soap molecules (composed of fatty acids) and undergo a reaction to form an insoluble gelatinous curd-like substance called the scum. This reaction prevents the formation of lather with soap easily in case of hard water. Hence hard water with soap will not give lather easily. Soft water gives lather with soap easily.
24) Which water gives lather with soap easily?
Answer is:
Soft water
Explanation:
Related Electrolysis and Electroplating MCQ with Answers
Answer is:
Green colour
Explanation:
In a universal pH indicator, a pH of 7 is typically associated with a green color. A pH of 7 is considered neutral, indicating a balance between acidic and basic conditions. The universal indicator is a mixture of different dyes that change color over a range of pH values, and green corresponds to the neutral pH level. As the pH becomes more acidic, the color shifts towards the red end of the spectrum, and as it becomes more alkaline, the color shifts towards the violet or blue end of the spectrum.
