Verified Solution • 2025–26 Session moderate

QAIPMT-2010-Ch-2029: NEET 2010 Chemistry - Class 11 AIPMT-2010-Ch-2029 Solution: What is \([H^+]\) in mol/L of a solution that is 0.20 M in…

What is [H+][H^+] in mol/L of a solution that is 0.20 M in CH3COONaCH_3COONa and 0.10 M in CH3COOHCH_3COOH? KaK_a for CH3COOH=1.8×10−5CH_3COOH=1.8\times10^{-5}

Multiple Choice Options

  • A 3.5×10−43.5\times10^{-4}
  • B 1.1×10−51.1\times10^{-5}
  • C 1.8×10−51.8\times10^{-5}
  • D 9.0×10−69.0\times10^{-6}

Step-by-Step Verified Solution

CH 3 COOH and CH 3 COONa constitute to form an acidic buffer. _ pH = pKa + log [ S a l t ] [ A c i d ] pH = �log(1.8 _ 10 �5 ) + log ( 0.20 ) ( 0.10 ) = 4.74 + log 2 = 4.74 + 0.3010 = 5.041 Now, pH = � log[H + ] _ 5.041 = � log[H + ] _ [H + ] = 10 �5.041 = 9.0 _ 10 6 mol L �1

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