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In a NaCI molecule there is an attractive force between Na+ ion and Cl- ion

1. Which law help us to find this attractive force? State the law.

2. State the law and write it’s mathematical form

3. Why NaCI molecule is easily soluble in water?

[Hint:- Dielectric constant of water is 81]

1 Answer

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Best answer

1. Coulombs law.

2. The force between two changes is directly proportional to product of their charges and inversely proportional to square of the distance between them. Force on q1 due q2 .

3. Force between two charges depends on the medium in between them.

i.e. F = \(\frac{1}{4\pi \varepsilon_0k}\) \(\frac{q_1q_2}{r^2}\)

For water molecule K = 81. Hence the force between two charge in water decreases by 81 times. As result NaCl molecule is easily soluble in water.

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