Question

What effect does the concentration of ${{H} ^ {+}} $(aq) have on the acidic nature of solution?

Answer 1

Hint: The increase in concentration of hydrogen ions leads to the increase in acidic nature of the solution. More is the no. of hydrogen ions more is the acidity of the solution. Acids have low pH level than bases, the increasing concentration of ${{H} ^ {+}} $lowers the pH value representing increase in acidic nature of the solution.

Complete step by step answer:
Acid donates hydrogen ions. The change in concentration of ${{H} ^ {+}} $ affects the acidity of the solution. If the concentration of hydrogen ions is increased the solution becomes more acidic and if the concentration of hydroxyl ions is increased the solution becomes more basic. The pH scale is used to determine the acidity or basicity of solution. It is known as the power or potential of hydrogen which is used to determine the concentration of ${{H} ^ {+}} $ ions in the solution. The pH scale ranges from value 0-14. The scale shows value less than 7 for acidic solutions and greater than 7 for basic solutions, pH of 7 comes under neutral i.e. at this pH value there are equal no. of hydrogen and hydroxyl ions.
The acidic nature increases as we approach values lower than 7 like solution with pH value 2 will be more acidic as compared to solution with pH value 6 which means that concentration of ${{H}^{+}}$ ions is more in solution with pH 2 as compared to solution with pH 6.
The relating formula for pH and concentration of ${{H} ^ {+}} $ is- $pH=-\log [{{H} ^ {+}}] $
After crossing the value 7 the acidic character is lost and basicity comes into action. The pH scale is logarithmic due to which each whole pH value below 7 is ten times more acidic than the next higher value.

Note:
The acid with high dissociation constant means that it will dissociate highly into its ions in the aqueous solution. Higher the dissociation constant, stronger is the acid, less is its pH value and higher is the concentration of hydrogen ions. Strong acids undergo neutralization reactions with strong bases to form neutral salt and water.