NCERT Solutions for Class 7 Science Chapter 5
Important NCERT Questions
7th Chapter 5 Acids, Bases and Salts
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 8 part: b
Explain why: Calamine solution is applied on the skin when an ant bites.
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Calamine solution is commonly used on the skin following an ant bite due to its soothing and anti-inflammatory properties. Here’s why it’s often recommended:
1. Soothing Properties: Ant bites can cause redness, itching, and mild swelling due to the venom injected. Calamine, containing zinc oxide and ferric oxide, offers a cooling effect. When applied, it helps relieve itching and provides a soothing sensation to the skin, offering relief from the discomfort caused by the ant bite.
2. Anti-Inflammatory Effects: Calamine possesses mild anti-inflammatory properties that help reduce the inflammatory response triggered by the ant bite. This action aids in decreasing redness and swelling around the affected area.
3. Drying Effect: Calamine also exhibits a drying effect when applied to the skin. It assists in drying out any fluids or discharge from the ant bite, forming a protective layer that supports the healing process.
4. Preventing Excessive Scratching: By easing itching and discomfort, calamine helps deter excessive scratching of the ant bite site. Excessive scratching can worsen irritation, potentially leading to infection and hindering the healing process. Calamine reduces the urge to scratch, promoting more effective healing of the bite.
In summary, applying calamine solution after an ant bite offers relief by soothing itching, reducing inflammation, aiding in drying out any discharge, and discouraging excessive scratching. This aids in quicker healing and provides relief from discomfort caused by the ant bite.
The sting of an ant contains formic acid which causes irritation on the skin. Calamine solution contains, zinc carbonate which is a base. Calamine solution neutralizes the acid effect of the ant bite when applied on the skin.
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