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Question

The number of molecules of water of crystallisation present in washing soda crystals is:

A

five

B

two

C

ten

D

seven

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Updated on : 2022-09-05

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Correct option is C)

The chemical formula of washing soda is Na

2 ​ CO 3 ​ ⋅10H 2 ​

O. It is sodium carbonate decahydrate. So it contains 10 water molecules.

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The number of molecules of water of crystallization present in washing soda are:

The number of molecules of water of crystallization present in washing soda are:

Byju's Answer Standard X Chemistry Solutions The number of... Question

The number of molecules of water of crystallization present in washing soda are:

A 1.5 B 10 C 5 D 7 Open in App Solution

The correct option is C

10

Washing soda has formula Na2CO3.10 H2O.Hence, it has 10 molecules of water of crystallization.

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SIMILAR QUESTIONS

Q. The number of molecules of water of crystallisation present in washing soda crystals is:Q. State the number of water molecules present in crystals of washing soda and plaster of Paris. What are these molecules called?Q.

The number of molecules of water of crystallisation present in washing soda crystals is :

(a) five (b) two (c) ten (d) seven

Q. Slide the number of water molecules present in washing soda.Q.

How many molecules of water of crystallisation (per formula unit) are present in :

(a) copper sulphate crystals ?

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Standard X Chemistry

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The number of molecules of water of crystallisation present in washing soda crystals isA) fiveB) twoC) tenD) seven

The number of molecules of water of crystallisation present in washing soda crystals isA) fiveB) twoC) tenD) seven. Ans: Hint: We have to remember that the chemical formula of washing soda is\\[{\\text{NaC}}{{\\text{O}}_{\\text{3}}}{\\text{.10}}{{\\t...

The number of molecules of water of crystallisation present in washing soda crystals is

A) five B) two C) ten D) seven

Last updated date: 13th Mar 2023

• Total views: 205.2k • Views today: 1.85k Answer Verified 205.2k+ views 1 likes

Hint: We have to remember that the chemical formula of washing soda is

NaC O 3 .10 H 2 O NaCO3.10H2O

. This washing soda plays a major role in the industrial process. This washing soda is prepared by Solvay process. The washing soda is prepared by using ammonia, water, sodium chloride and Carbon dioxide. The preparation of washing soda two main factors are main. One is solubility and the other is isolation.

Complete answer:

We also know that the general chemical formula of washing soda is

NaC O 3 .10 H 2 O NaCO3.10H2O

. It is a crystallized form. From free form to crystalline form it requires some amount of water. The chemical formula of free form of washing soda is

NaC O 3 NaCO3

. But this free form of washing soda is not stable. Hence, we convert into crystalline form. In crystallisation technique, we use solvent for dissolution of washing soda and anti-solvent used for crystals formation.

The chemical reaction of crystallisation of washing soda is given below,

NaC O 3 + n H 2 O→NaC O 3 .10 H 2 O

NaCO3 + nH2O→NaCO3.10H2O

Now, it is a dehydrated form. Then only it is forming proper crystallized nature. The washing soda in monohydrate form means it completely converts into crystal to white ash.

Hence, ten molecules of water of crystallisation present in washing soda.

Note:

We must remember that the washing soda is mainly used for laundering purposes. Washing soda is also used for laboratory purposes also. In qualitative analysis and volumetric analysis also washing soda is used. Washing soda is also used in water treatment. It is used for converting hard water to soft water. The washing soda is also used for manufacturing of paper, glass and paints.

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