Acids, Bases and Salts Important Questions

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Introduction to Acids, Bases, and Salts
Indicators
Explanation
Sample Questions

Introduction to Acids, Bases, and Salts:

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Acids: Acids turn blue litmus paper into red litmus paper. Acids are basically sour in taste and when they are dissolved in water they generally release H+ions.
Bases: Bases turn red litmus to blue litmus paper. Bases are basically bitter in taste and in an aqueous solution it releases hydroxide ions.
Salts: Salts are basically used to improvise the taste of food. When a neutralization reaction between acid and base happens then they produce an ionic compound which is salts. Sodium chloride is the most known and commonly used salt among others. The other name of Sodium Chloride is a common salt.

Indicators

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Indicators tell us whether the compound is acid or base. The indicator indicates by changing colour or by changing the odor according to the compound. They are also known as acid-base indicators. Indicators are natural as well as man-made. The most common and popularly used natural indicator is Litmus paper.

Explanation

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Let us now see the changes incurred by acids, bases, and salts on the indicators.

ACIDS:

When tested on litmus paper acids generally turn the blue litmus into red litmus paper.
The taste of acidic compounds is generally sour.
Acidic solutions also conduct electricity.
H+ ions are released when an acidic compound is in an aqueous solution.

BASES:

The taste of base compounds is generally bitter.
Bases are generally soapy in texture.
When tested on litmus paper bases generally turns red litmus paper into blue litmus paper.
The Base compounds also conduct electricity in solution.
OH- ions are released when base compounds are in an aqueous solution.

SALTS:

The texture of salts is usually solid and crystal-like in shape.
Salts are usually opaque and transparent.
Salts do get easily soluble in water.
Salt solutions also contain electricity.
Some salts are coloured while others are colourless.
The salts which are neutral in nature are generally odorless.
The PH value of acidic salt is less than 7.
The PH value of basic salt is more than 7.
The PH value of a neutral salt is equal to 7.

Sample Questions

Ques. Explain the reason for tooth decay and how it is related to pH? (1 mark)

Ans. The relation of tooth decay is lower the pH, the more will be tooth decay.

Ques. What is acid? (1 mark)

Ans. Acids are compounds that release H+ions when dissolved in an aqueous solution.

Ques. What is the pH value of acid? (1 mark)

Ans. The pH value of acid is 7.

Ques. Give some examples of acid. (1 mark)

Ans. Sulphuric acid and acetic acid are few examples of acid.

Ques. What are H+ ions? (1 mark)

Ans. H+ ions mean hydronium ions.

Ques. What is the pH value of the base? (1 mark)

Ans. The pH value of the base is more than 7.

Ques. What is the usual texture of the base? (1 mark)

Ans. The usual texture of the base is slippery and soapy.

Ques. In which colour the base turns litmus paper into? (1 mark)

Ans. The base turns red litmus paper into blue litmus paper.

Ques. Give two examples of the base. (1 mark)

Ans. The two examples of the base are ammonia and sodium hydroxide.

Ques. Explain the work of antacids. (1 mark)

Ans. The nature of Antacid is basic. Antacid neutralizes excess acid and gives relief from pain and ache that is caused by hyperacidity.

Ques. Are all acids soluble in water? (1 mark)

Ans. Yes, all acids are soluble in water.

Ques. Which salt is known as common salt? (1 mark)

Ans. NaCl or Sodium chloride is also known as Common or Table Salt. When sodium hydroxide reacts with hydrochloric acid it produces sodium chloride.

Ques. What is the pH value of NaCl? (1 mark)

Ans. The pH value of NaCl is more than 7 because it is based on nature.

Ques. What are acidic salts? (1 mark)

Ans. Acidic salts are salts that are formed when the reaction between a strong acid and a weak base happens. Some examples of acidic salts are ammonium chloride and ammonium sulphate.

Ques. What are basic salts? (1 mark)

Ans. Basic salts are salts that are formed when the reaction between a weak acid and a strong base happens. Some examples of basic salts are Sodium carbonate and Sodium acetate.

Ques. When does neutral salt form? (1 mark)

Ans. When the equally strong base and acid react, they completely neutralize each other. Due to this reaction, a neutral salt is formed.

Ques. Name some weak acids and strong acids. (1 mark)

Ans. Carbonic acid (H2CO3) and Acetic acid (CH3COOH) are weak acids. Some examples of strong acids are Hydrochloric acid (HCl), Nitric acid (HNO3), and Sulphuric acid (H2SO4).

Ques. What are some natural acids? (1 mark)

Ans. Oxalic acid (C2H2O4), Acetic acid (CH3COOH), and Methanoic acid (HCOOH) are some natural acids.

Ques. What is a natural indicator? (1 mark)

Ans. Natural indicators are indicators that are obtained from natural sources. Some natural indicators are Litmus paper, china rose, turmeric, and red cabbage.

Ques. What are synthetic indicators? (1 mark)

Ans. Indicators synthesized in the laboratory are known as Synthetic Indicators. They are also man-made indicators. Some examples of synthetic indicators are methyl, Phenolphthalein orange, etc.

Ques. What are olfactory indicators? (1 mark)

Ans. Olfactory indicators are indicators that change their smell when mixed with acid or base. Some examples of olfactory indicators are Onion, vanilla, etc.

Ques. How does soda acid work as a fire extinguisher? (1 mark)

Ans. Soda acid liberates carbon dioxide CO2 with sulphuric acid H2SO4, which extinguishes the fire.

Ques. Explain how salts are formed. (1 mark)

Ans. Salts are formed due to the reaction of an acid with a base. A salt consists of positive and negative ions. the positive ion of a base and the negative ion of acid.

Acids, Bases and Salts Important Questions

Introduction to Acids, Bases, and Salts:

Indicators

Explanation

Sample Questions

CBSE X Related Questions

1.
What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.

2.
To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must be:

3.
Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.

4.
Write one function each of the parts - (i) petals (ii) anther (iii) style and (iv) ovary of a bisexual flower.

5.
Name a metal found in the earth's crust:
(i) in free state and
(ii) in the form of its compound.
State where each of these metals are placed in the reactivity series of metals

6.
What happens when butane is burnt in air? Write the chemical equation for the reaction. Differentiate between the flames obtained when butane and butyne both are burnt in air in similar conditions.

Similar Science Concepts

Comments

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Acids, Bases and Salts Important Questions

Introduction to Acids, Bases, and Salts:

Indicators

Explanation

Sample Questions

CBSE X Related Questions

1.What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.

2.To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must be:

3.Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.

4.Write one function each of the parts - (i) petals (ii) anther (iii) style and (iv) ovary of a bisexual flower.

5.Name a metal found in the earth's crust:(i) in free state and (ii) in the form of its compound. State where each of these metals are placed in the reactivity series of metals

6.What happens when butane is burnt in air? Write the chemical equation for the reaction. Differentiate between the flames obtained when butane and butyne both are burnt in air in similar conditions.

Similar Science Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.

2.
To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must be:

3.
Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.

4.
Write one function each of the parts - (i) petals (ii) anther (iii) style and (iv) ovary of a bisexual flower.

5.
Name a metal found in the earth's crust:
(i) in free state and
(ii) in the form of its compound.
State where each of these metals are placed in the reactivity series of metals

6.
What happens when butane is burnt in air? Write the chemical equation for the reaction. Differentiate between the flames obtained when butane and butyne both are burnt in air in similar conditions.