Roughly how many water molecules are ionized at any given time in a sample of room-temperature water?

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25-08-2022
Chemistry

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Roughly how many water molecules are ionized at any given time in a sample of room-temperature water?

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tutorconsortium31 tutorconsortium31 · Answer 1 · 2022-09-03T20:40:54+02:00

Roughly one in a trillion water molecules are ionized at any given time in a sample of room-temperature water

The dissociation of water can be written as

H2O --------> H+ + OH-

The equilibrium constant for this dissociation is called the kw and has the value 10−^14 One trillion is 10^15

Therefore the number of molecules dissociated should be one in ten trillion.

Water does self-ionize, but not very much. At 25°C (room temperature) and standard atmospheric pressure, one liter of pure, neutral water contains only 0.0000001 moles of each dissociative ion.

What is Ionization ?

Ionization, also known as ionisation, is the process by which an atom or molecule gains or loses electrons to acquire a negative or positive charge, frequently in conjunction with other chemical changes. Ions are the electrically charged atoms or molecules that arise.

In the creation of salt, an electron is given up by the sodium atom, giving it a positive charge, while an electron is taken by the chlorine atom, giving it a negative charge.

Learn more about Ionization here:

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