A little of sodium hydroxide pellets are taken in a beaker and water is added slowly to it.
(a) Will there be any change in the temperature of the contents ?Explain.
(b) Name and define the type of reaction that is taking place.
(3 marks)

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Solution

(a) The temperature of solution will rise as the reaction of sodium hydroxide with water releases heat energy. This makes the solution warm.

(b) It is an exothermic reaction. It is defined as a type of reaction that releases heat. It gives the net heat energy to the surroundings.

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Similar questions

What type of change takes place when a sodium hydroxide pellet is added to water?

Q. 4 grams of sodium hydroxide pellets were dissolved in

100 {c m}^{3}

of water. The temperature before adding the sodium hydroxide pellets was 25 degrees C, and after adding the pellets it was 35 degrees C. Calculate the enthalpy change in

k J / m o l e

of the reaction.

[Specific heat capacity of water

= 4.2 J / k / g]

Q. There are 4 beakers A, B, C and D with water in it.
a) Sodium hydroxide is added to beaker A.

b) Potassium hydroxide is added to beaker B.

c)Ferric hydroxide is added to beaker C.

d)Lithium hydroxide is added to beaker D.

Which solution will form suspension?

A student prepared $20 %$ sodium hydroxide solution in a beaker containing water. The observations noted by him are given below

(I) Sodium hydroxide is in the form of pellets.

(II) It dissolves in water readily.

(III) The beaker appears cold when touched from outside.

(iv) The red litmus paper turns blue when dipped into the solution

100 mL of water at room temperature of $25^{\circ} C$ is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring while keeping the temperature of solution constant at $30^{\circ} C .$ After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.

(a) What name is given to solutions like X?

(b) What name is given to solutions like Y?

(c) What will you observe if the solution Y at $30^{\circ} C$ is cooled down to $10^{\circ} C$ by keeping the beaker in crushed ice? Why?

(d) What term is used to denote the amount of solid dissolved in 100 grams of water in a solution like Y?

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A little of sodium hydroxide pellets are taken in a beaker and water is added slowly to it. (a) Will there be any change in the temperature of the contents ?Explain. (b) Name and define the type of reaction that is taking place. (3 marks)

(a) The temperature of solution will rise as the reaction of sodium hydroxide with water releases heat energy. This makes the solution warm. (b) It is an exothermic reaction. It is defined as a type of reaction that releases heat. It gives the net heat energy to the surroundings.

A little of sodium hydroxide pellets are taken in a beaker and water is added slowly to it.
(a) Will there be any change in the temperature of the contents ?Explain.
(b) Name and define the type of reaction that is taking place.
(3 marks)

(a) The temperature of solution will rise as the reaction of sodium hydroxide with water releases heat energy. This makes the solution warm.

(b) It is an exothermic reaction. It is defined as a type of reaction that releases heat. It gives the net heat energy to the surroundings.