Question

Mohan has three solutions, X, Y and Z. The pH of solutions of X, Y and Z is 6, 4 and 11 respectively. Arrange solutions X, Y and Z in the increasing order of hydrogen ion concentration and choose the correct option.
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Answer 1

Increasing order of hydrogen ion concentration of solutions X, Y, and Z    is Z < X < Y.

• pH = - log[H⁺]
• Negative sign indicates that higher is the pH of a solution, lower will be its hydrogen ion concentration, [H⁺], and vice-versa.
• On a pH scale, i.e. from pH = 0 to pH = 14, at pH 7 solution is considered to be neutral.
• If pH is lesser than 7, the solution is said to be acidic in nature.
• If pH is greater than 7, the solution is said to be basic in nature.
• H⁺ ions, contribute to the acidity of a solution, and OH⁻ ions contribute to the basicity of a solution.
• Higher is the H⁺ ion concentration, the more acidic will be the solution and lesser will be its pH.
• Solution X and Y are acidic in nature, as their pH is less than 7.
• Y is more acidic and has higher [H⁺] than X as its pH is lesser than X.
• Solution Z is basic in nature, as its pH is 11 which is more than 7 and it's [H⁺] will be the least.

Answer 2

Answer:

X > Y > Z

Explanation:

• pH = negative log [H⁺]
• The negative sign implies that as a solution's pH rises, so does its hydrogen ion concentration, [H+], and vice versa.
• On a pH scale ranging from 0 to 14, a solution with a pH of 7 is considered neutral.
• If the pH of a solution is less than 7, it is considered to be acidic.
• A solution is said to be basic if its pH is greater than 7.
• H+ ions contribute to a solution's acidity, while OH ions contribute to a solution's basicity.
• The higher the H+ ion concentration, the more acidic the solution and the lower the pH.
• Because pH is -log|H+| concentration, the order of hydrogen ion concentration is X > Y > Z.

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