100 ml of each of 0.5 N NaOH, N/5 HCl and N/10 H2SO4 are mixed together. The resulting solution will be:

Correct answer: C. Alkaline

  • A. Acidic
  • B. Neutral
  • C. Alkaline
  • D. None

Explanation

To determine the nature of the resulting solution, calculate the total equivalents of H+ and OH- ions. The 0.5 N NaOH provides 0.05 equivalents of OH- ions in 100 ml. The N/5 HCl provides 0.02 equivalents of H+ ions, and N/10 H2SO4 contributes 0.01 equivalents of H+ ions, totaling 0.03 equivalents of H+ ions. Since 0.05 equivalents of OH- are greater than the 0.03 equivalents of H+, the solution is alkaline. Options A and B are incorrect as they do not account for the excess OH- ions. Option D is incorrect because the solution clearly shows an alkaline nature.

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About Acids, Bases and Salts

Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.

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