ning Jump to... Yusuf Moham 11/16/2017 06:00 PM88.8/1001 1/16/2017 04:32 AM Prin

Question

ning Jump to... Yusuf Moham 11/16/2017 06:00 PM88.8/1001 1/16/2017 04:32 AM Print Calculator led Periodic Table Gradebook O Assignment Inf re Available From: Due Date: Points Possible: Grade Category: Question 8 of 10 Sapling Learning son ohld be horerboian eoguvalence point at pH A3 using this tabe,identihy which of the following would be appropriate for this titration. Check all that apply Titration Data Description: phenolphthalein bromothymol blue ethyl orange bromophenol blue methyl orange bromocresol purple Policies: You can check your You can view solutio give up on any quest You can keep trying t until you get it right You lose 5% of the po answer in your questi attempt at that answe PH 5.3 end-point pH range 3.3 Titrant volume O eTextbook O Help With This Topic O Web Help & Videos O Technical Support and i O Prevcus Give Up & View Solution 0 Check Answer (D Next Exit Hint terms of use contact us help to search

Explanation / Answer

The best indicator will be the one whose pKa value falls within 1 unit of the pH, i.e, the indicator must have pKa 3.3 – 5.3. Bromophenol blue and methyl orange have pKa values 4.1 and 3.7 respectively.

The acid-base indicator itself acts as a buffer and resists any change in pH of the solution due to addition of acid or base. The closer the pKa value of an acid-base indicator to the pH at the equivalence point, the better suited is the indicator for the titration. Therefore, bromophenol blue is the best indicator here.

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