Account for the following.
a. Dry HCl gas does not change the colour of dry blue litmus paper
b. Antacid tablets are used by a person suffering from stomach pain.
c. Toothpaste is used for cleaning teeth.
Answers
Answer:
1) hcl is acid but does not change color of blue litmus paper becouse hcl release H+ ions on dilution in water and litmus get red due to presence of H+ions in water due to dissociation.
2) antacid is basically a mild base which neutralize the excessive acid in stomach which is called acidity and hence relief in stomach pains
3) as aur mouth is more prone to get infected by bacteria on our food present between aur teeth. bacteria get nutrition on that and release acid as the byproduct so aur toothpaste contains mild base to neutralize this acid and protect aur teeth to get damage by acid
Hope this helps u
Answer:
a. Dry HCl gas on coming in contact with dry blue litmus paper does not produce H+ ions and hence, the colour of the litmus paper does not change.
b. Antacid tablets generally consists of magnesium hydroxide and aluminium hydroxide, which are mild bases. They react chemically with the hydrochloric acid produced in stomach and neutralise it.
c. All toothpaste contain some substances that are basic in nature and hence neutralise acids. So the best way to avoid cavities is to brush your teeth with some toothpaste.