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BITSAT 2024
Exam
BITSAT
Year
2024
Subject
Chemistry
Chapter
Ionic Equilibrium

BITSAT 2024 · Chemistry · Ionic Equilibrium

The pH of 1 N aqueous solutions of HCl , CH_3 COOH and HCOOH...

The pH of 1 N aqueous solutions of HCl , CH3COOH\mathrm{CH}_3 \mathrm{COOH} and HCOOH follows the order:

Options

  1. AHCl>HCOOH>CH3OOH\mathrm{HCl}>\mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{OOH}
  2. BHCl=HCOOH>CH3COOH\mathrm{HCl}=\mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{COOH}
  3. CCH3COOH>HCOOH>HCl\mathrm{CH}_3 \mathrm{COOH}>\mathrm{HCOOH}>\mathrm{HCl}
  4. DCH3\mathrm{CH}_3\mathrm{COOH}=\mathrm{HCOOH}>HCl>\mathrm{HCl}

Correct answer

C. CH3COOH>HCOOH>HCl\mathrm{CH}_3 \mathrm{COOH}>\mathrm{HCOOH}>\mathrm{HCl}

Step-by-step solution

Stronger the acid, lower is the pH or weaker the acid, higher the pH. The strength of the given acid is in the order HCl>HCOOH>CH3COOH\mathrm{HCl}>\mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{COOH} Hence, their pH is in the order CH3COOH>HCOOH>HCl\mathrm{CH}_3 \mathrm{COOH}>\mathrm{HCOOH}>\mathrm{HCl}
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