Chapter 6|Chemistry 9th class|tutoronlines

Chapter No 6

SLUTIONS

Table of content:

Sr. No. Name of topic
1 Solvent
2 Solute
3 Aqueous Solution
4 Solution
5 Universal Solvent
6 Mixture
7 Saturated and Unsaturated Solution
8 Super Saturated Solution
9 Alloy
10 Solid Liquid Solution
11 Liquid in Liquid Solution
12 Dilute and concentrate Solution
13 Percentage v/m
14 Molarity
15 Percentage m/m
16 Percentage m/v
17 Percentage v/v

Given the Answer of the following Question.

Q.No.1. Define solvent and solute?
Ans. Solute:

The component of solution present in relatively lesser amount is called solute.

Solvent:

The component of solution present in relatively large amount is called Solvent.

Q.No.2. Define aqueous Solutions?

Ans. The solution which is formed by dissolving substance in water is called aqueous solution. In aqueous solution water is in large amount.

Q.No.3. Differentiate between solution and aqueous solution?
Ans. Solution:

The homogeneous mixture of two or more things e.g solution of sugar.

Aqueous solution:

A type of solution formed by dissolving something in water. e.g solution of sugar and salt in water is aqueous solution.

Q.No.4. Why water is called in universal solvent?

Ans. Because mostly compounds in the universe dissolve in water. That is why water is known as universal solvent.

Q.No.5. What is the difference between solution and mixture?

Ans. The homogeneous mixture of two or more things is called solution. The component in solution are in same phase, while the component of mixture are not uniform. They are in different phase.

Q.No.6. How can you distinguish between solution and pure solvent?

Ans. Through evaporation, difference between solution and pure liquid is found.

Q.No.7. What is homogenous mixture of two or more substances?

Ans. The homogenous mixture of two or more substances is called solution.

Q.No.8. What do you mean by unsaturated solution?

Ans. A solution which contains lesser amount of solute than that which is required to saturate it at a given temperature is called unsaturated solution.

Q.No.9. Define saturated solution?

Ans. A solution which contains maximum amount of solute at a given temperature is called saturated solution. At particle level, the saturated solution is that in which undissolved solute is in equilibrium with dissolved solute.

Q.No.10. Differentiate between saturated and unsaturated solution?
Ans. Saturated solution:

A solution which contains maximum amount of solute at a given temperature is called saturated solution.

Unsaturated solution:

A solution which contains lesser amount of solute than that which is required to saturated it at a given temperature is called unsaturated solution.

Q.No.11. Define super saturated solution?

Ans. A solution which required more amount of solute than that required for preparing it saturated solution at particular a given temperature is called super saturated solution. These are more concentrated than saturated solution.

Q.No.12. What is alloy? Give an example?

Ans. Mixture of two metals is called alloy. For example Brass is a mixture of copper and zinc

Q.No.13. Write down example of a solution in which solute is liquid and solvent is gas?

Ans. Fog, Mist.

Q.No.14. What is solid liquid solution? Give an example?

When solid ( Solute ) is dissolved in liquid ( Solvent ) it is known as solid liquid solution. e.g sugar in water.

Q.No.15. Write down two examples of liquid in liquid solution?

Ans. 1. The soltuion of water in alcohol.
2. The solution of benzene in toluene.

Q.No.16. What is difference between dilute solution and concentrate solution?
Ans. Dilute solution:

A type of solution in which more solvent is present than solute.

Concentrated solution:

A solution in which amount of solute is more than solvent.

Q.No.17. What is % v/m?
Ans. Percentage v/m:

It is the volume in cm3 of a solute dissolved in 100 g of solution. For example 10 % v/m alcohol solution in water means 10cm3 of alcohol is dissolved in water to make 100g solution. In such solution the mass of solution is dissolved in water to make 100g solution. In such solution the mass of solution is under consideration volume is not considered.
%v/m = volume of solute/mass of solution x100

Q.No.18. Define molarity?

Ans. It is define as number of moles of solute present in one dm3 of the solution. It is represented by M. Molarity is a concentration unit.
Number of moles = Mass of solute in grams / molar mass of solute.
M = mass of solute in gram / ( molar mass of solute g/mole ) x ( volume of solution in dm3 ).

Q.No.19. What is percentage (%m/m)?

Ans. It is number of grams of solute dissolve in 100 grams of solution. For example 10% m/m sugar solution means that 10g of sugar is dissolve in 90gm of water to make the solution 100g.

Q.No.20. What is meant by (%m/v)?

Ans. It is number of gram of solute dissolve in 100cm3 of solution. For example 10% (m/v) sugar solution contains 10g of sugar is dissolve in 100cm3 of solution. The exact volume of solvent is not mentioned.
% mass/ volume = Mass of solute/ volume of solution x 100.

Q.No.21. What do you mean by volume/ volume %?

Ans. The amount of volume of solute in cm3, which is dissolve in 100cm3 of solution called percentage v/v.
Percentage v/v= volume of solute/volume of solution

Q.No.22. How one molar solution is prepared?

Ans. To prepare 1 molar solution one mole of solute is dissolve in water to make volume of solution 1dm3. This solution is make in measuring flask.

Q.No.23. How one molar solution of NaOH is prepared?

Ans. To prepare 1 molar of sodium hydroxide, take 1 mole (40g) of salt and dissolved in water to make the volume of 1dm3.

Q.No.24. Write the name of ways in which concentration unit are expressed?

Ans. Concentration unit are given below

  1. Percentage mass / mass
  2. Percentage of mass /volume
  3. Percentage of volume/ mass
  4. Percentage of volume/ volume

Q.No.25. How much NaOH is required to prepare its 500cm3 of 0.4 M solution?

Ans. Molar mass of NaOH = 40g/mole
Volume in dm3 = 500 cm3 /1000cm3 x 1dm3 = 0.5dm3
Molarity= mass of solute in gram/ molar mass x volume of solution
Mass of solute = molarity x molar mass of solute x volume of solution
= 0.4 x 40 x 0.5
= 8g

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