Suppose that you want to titrate a sample of vinegar with standard sodium hydroxide solution to determine the concentration of acetic acid in it, and you want to use an indicator to help you determine the end-point. Which of the following indicator would be suitable? (A) Bromocresol Green (Ka ~ 2.0 x 10–5; color: yellow in acid; blue in base) (B) Methyl Red (Ka ~ 5.0 x 10–6; color: red in acid; yellow in base) (C) Bromothymol Blue (Ka ~ 6.0 x 10–8; color: yellow in acid; blue in base) (D) Any of them
Suppose that you want to titrate a sample of vinegar with standard sodium hydroxide solution to determine the concentration of acetic acid in it, and you want to use an indicator to help you determine the end-point. Which of the following indicator would be suitable?
(A) Bromocresol Green (Ka ~ 2.0 x 10–5; color: yellow in acid; blue in base)
(B) Methyl Red (Ka ~ 5.0 x 10–6; color: red in acid; yellow in base)
(C) Bromothymol Blue (Ka ~ 6.0 x 10–8; color: yellow in acid; blue in base)
(D) Any of them
For titration of weak acid ( Vinegar ) and Strong base ( Sodium hydroxide ) suitable indicator is Bromothymol Blue, because it has pH range above 7 .
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