Q35 5 mol of H2O contain no of OH ions ?
Ans 3.10×10^24ions
To determine the number of hydroxide (OH-) ions in 5 mol of H2O (water), we need to understand the chemical formula of water and the concept of moles.
The chemical formula for water is H2O, which means each water molecule contains two hydrogen atoms (H) and one oxygen atom (O). In water, a small fraction of molecules dissociate into hydrogen ions (H+) and hydroxide ions (OH-).
Here's how you can calculate the number of OH- ions:
1. Determine the number of moles of water (H2O):
Given that you have 5 mol of H2O.
2. Calculate the Avogadro's number:
Avogadro's number is 6.022 × 10^23, which represents the number of particles (atoms, molecules, or ions) in one mole of a substance.
3. Find the number of molecules of water:
Multiply the number of moles of water by Avogadro's number:
5 mol × 6.022 × 10^23 molecules/mol = 3.011 × 10^24 molecules of water
4. Determine the molar ratio of hydroxide ions to water molecules:
One water molecule (H2O) produces one hydroxide ion (OH-). Therefore, the ratio is 1:1.
5. Calculate the number of hydroxide ions:
The number of hydroxide ions is the same as the number of water molecules:
3.011 × 10^24 molecules of water = 3.011 × 10^24 OH- ions.
Therefore, 5 mol of H2O contains 3.011 × 10^24 hydroxide (OH-) ions.
Note: The answer provided assumes complete dissociation of water into its ions, which may not be entirely accurate in reality.