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Question

What is the pH value of Sulphuric acid?


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Solution

Part 1: pH

  • The pH of any solution is defined as the negative log of Hydrogen ion concentration.
  • Mathematically, pH=-log10[H+]
  • pH is used to determine the nature of the solution whether it is acidic, basic, or neutral.
SolutionpH range
Acidic1 - 6.9
Neutral7
Basic7.1 - 14

Part 2: Identifying the pH of the sulphuric acid

  • Depending on the values of pH we can further classify the solution as strongly and weakly acidic and basic.
  • Sulphuric acid is a strong acid that completely dissociates into its ions to produce hydrogen ions when dissolved in water.
  • The dissociation reaction can be represented as:

H2SO4(aq)Sulphuricacid2H+(aq)Hydrogenion+SO42-(aq)Sulphateion

  • The pH value of Sulphuric acid lies in the range of approximately 2-3.

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