EXERCISES
4. VERY SHORT ANSWER TYPE QUESTIONS
1.Name two naturally occurring acids with their source
2. How does a litmus detect acidic and basic solutions ?
3How does an indicator differentiate an acid and a base ?
4Name a base used in antacids.
5. When a red litmus paper is dipped in a solution, it turned blue. What is the nature of the solution?
Acids, Bases and Salis
Answers
Answer:
1. Some naturally occurring acids are: vinegar (acetic acid), citric acid (present in orange and lemon) and tartaric acid (present in tamarind). Our stomach also produces hydrochloric acid which helps in the digestion of food.
2. Litmus is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. So, it is used to test the acidic or basic nature of solutions.
3.An acid turns blue litmus paper red. A base turns red litmus paper blue. ... Substances which change their smell when mixed with acid or base are known as olfactory indicators. For example onion, vanilla, clove, etc.
4. magnesium hydroxide
5. Acidic solutions change blue litmus red, hence it is not acidic. Bases change red litmus to blue hence there is no change in colour of blue litmus paper. Neutral solutions have no effect on litmus paper.
Explanation: