Answer:
Total 8 electrons.
Explanation:
To draw a complete lewis structure in water molecule we will calculate the total number of valence electrons
Valence electrons:
Two hydrogen atoms: 2 valence electrons (one each)
One oxygen atom : 6 valence electrons
So total there will be 8 electrons that must be shown in the structure.
Out of these 8, four will be involved in two covalent bonds
Rest four will be in the form of two lone pair of electrons on oxygen atom.
Answer : The hydroxide ion concentration of a solution is,
Explanation :
As we know that dissociates in water to give hydrogen ion
and carbonate ion
.
As, 1 mole of dissociates to give 1 mole of hydrogen ion
Or, 1 M of dissociates to give 1 M of hydrogen ion
So, 0.200 M of dissociates to give 0.200 M of hydrogen ion
Now we have to calculate the hydroxide ion concentration.
As we know that:
Therefore, the hydroxide ion concentration of a solution is,