5.
V. Short Answer Questions
1.
Name a natural indicator used for identifying a basic substance. Also mention the colour change.
2.
What are bases? What is the difference between a base and an alkali?
3. What are acids? Mention any two important properties of acids.
4. What is meant by neutralisation? What are the products of a neutralisation reaction?
5. What is an antacid? Why is it used?
Answers
Answer:
1. When Phenolphthalein is added to basic solution then it appears pink in color. Natural indicators are the substances used to determine the pH of a substance. For example, turmeric and beet root juice are the natural indicators.
2. Difference between Alkali and Base
Base Alkali
• Bases do not • Bases that dissolve in
dissolve in water water are alkali
•All bases are not • All alkali are bases
alkali
3. An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.
Properties of acids
• Aqueous solutions of acids are electrolytes, meaning that they conduct an electrical current.
• Acids have a sour taste.
• Acids change the color of certain acid-base indicators.
4. Neutralization is the reaction of an acid and a base, which forms water and a salt. Net ionic equations for neutralization reactions may include solid acids, solid bases, solid salts, and water.
5. This medication is used to treat the symptoms of too much stomach acid such as stomach upset, heartburn, and acid indigestion. It is also used to relieve symptoms of extra gas such as belching, bloating, and feelings of pressure/discomfort in the stomach/gut.