Q. 164.3( 6 Votes )

Give reasons:

(i) Use of a mild base like baking soda provides relief on the area stung by honeybee.

(ii) Baking powder is added to make the cakes spongy and soft.

(iii) The colour of blue copper sulphate crystals changes to white on heating.

Answer :

(i) When a honeybee stings a person, this means it releases an acidic liquid (formic acid) into the body. This causes too much pain and irritation. As we know that baking soda (sodium hydrogen carbonate NaHCO3) is a mild non-corrosive base. It can be used to neutralize an acid.


Hence, when it is applied to the stung area, it reduces the effect of acid by neutralizing the excess acid. As a result, the pain and irritation is reduced.


(ii) Baking powder, which is a mixture of baking soda and tartaric acid. When baking soda is heated or mixed in water, the reaction takes place is given as:



Carbon dioxide released during the reaction causes the bread or cake dough to rise which makes them soft and spongy.


(iii) The colour of blue copper sulphate crystals changes to white on heating because:


a. Blue copper sulphate crystals contain water of crystallization.


b. When we heat the crystals, the water is removed.


c. As a result, the salt turns white.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Champ Quiz | All About Reactions of Acids and BasesChamp Quiz | All About Reactions of Acids and BasesChamp Quiz | All About Reactions of Acids and Bases38 mins
Genius Quiz | Salts Used in Daily LIfeGenius Quiz | Salts Used in Daily LIfeGenius Quiz | Salts Used in Daily LIfe40 mins
Quiz | Acid: Types and NomenclatureQuiz | Acid: Types and NomenclatureQuiz | Acid: Types and Nomenclature50 mins
Know all About Crystallization of WaterKnow all About Crystallization of WaterKnow all About Crystallization of Water26 mins
Smart Revision | Importance of pHSmart Revision | Importance of pHSmart Revision | Importance of pH52 mins
pHpHpH43 mins
Champ Quiz | All About Acids and BasesChamp Quiz | All About Acids and BasesChamp Quiz | All About Acids and Bases31 mins
Acid - Types and NomenclatureAcid - Types and NomenclatureAcid - Types and Nomenclature52 mins
Learn to Make Your Own Acid Rain and pH Paper at Home!Learn to Make Your Own Acid Rain and pH Paper at Home!Learn to Make Your Own Acid Rain and pH Paper at Home!27 mins
Smart Revision | Master Everything about Salts in One ShotSmart Revision | Master Everything about Salts in One ShotSmart Revision | Master Everything about Salts in One Shot52 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses