Question Distilled white vinegar is used for cooking but can also be used in many applications for cleaning. The active ingredient in vinegar is acetic acid (CH3COOH), which has a pKa= 4.74). If household vinegar produces a pH of 4.2,what is the initial concentration(in M)of CH 3 3 COOH (assuming it is the only substance contributing to pH)? Question 1 Homework. Answered Distilled white vinegar is used for cooking but can also be used in many applications for cleaning. The active ingredient in vinegar is acetic acid (CH3COOH), which has a pka=4.74). If household vinegar produces a pH of 4.2,what is the initial concentration(in M)of CH3COOH (assuming it is the only substance contributing to pH)? O A 2.19x10-4 0 B 0.10 o C 4.10 x 103 OD 0.87
Distilled white vinegar is used for cooking but can also be used in many applications for cleaning. The active ingredient in vinegar is acetic acid (CH3COOH), which has a pKa= 4.74). If household vinegar produces a pH of 4.2,what is the initial concentration(in M)of CH 3 3 COOH (assuming it is the only substance contributing to pH)?
    Answer :   The initial concentration of acetic acid is A). 2.19 × 10^-4 M     Explanation :   Here given data :   • pH of solution = 4.2   • pKa of acid = 4.74   Step 1 of 3   Calculate [H+] from pH :           We know that,   pH = - log [H+]   => [H+] = 10^-pH      => [H+] = 10^- 4.2   => [H+] = 6.31 × 10^-5  M   Step 2 of 3   Calculate Ka from pKa :     pKa = - ... See the full answer