Q14 / 102 · NTA Abhyas (JEE Main) 2020 · Chemistry · Ionic Equilibrium

pH of a 1000 cc solution is 2. It will not change if

  • A
    100 cc of water is added to it
  • B
    100 cc of 0.1 M HCl is added to it
  • Correct answer
    C
    100 cc (N/100) HCl is added to it
  • D
    1 cc of 0.1 M HCl is added to it.

Solution

If two solutions of same pH are mixed, no change in pH is observed. pH of water will be 7, that of 100 cc of 0.1 M HCl and 1 cc of 0.1 M HCl will be 1 (as H + concentration is 0.1 )
0.01 N HCl has also pH=2.
So adding this to a 1000 cc solution of pH 2 will not make any difference in pH

Hence, the correct answer is option: 'C'.

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