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ID: 922215 • Letter: E
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e Chegg Study Questions a x MCommon Hw #10 (LAST x P Pando a Internet Radio x G what is the pH of the t trax -> fi Dezto.mheducation.com/hm.tpx?--0.309671 31 833641 55-1448896943222 :: Apps P Pandora EMAIL Th Moodle Top Hat whentowork N Netflix webadvisor 9 BOM MCHEM Connect Use Figure 19.5 To Choosx eUse The Figu e Below To ure Below To X 9 CALC chem 9 rent EJEMBE West Virginia Histor @ Sign In: Discover 2 out of 3 attempts Assistance Be sure to answer all parts. Use the figure below to find an indicator for these titrations: (a) 0.25 M C6H5 COOH (Ka = 6.3x 10-) with 0.25 M KOH Bromphenol blue (b) 0.50 M NH4CI (K. 5.68 x 10) with 0.50 M NaOEH Crystal violet Check My Work Question Help Report a Problem -10 pH 10 12 13 14 Crystal violet Thymal blue Bromphenol blue Bromcresol green Methyl red Alizarin References eBook &Resources; Multipart Answer Difficulty: Medium Section: 19.02 10:29 AM 11/30/2015Explanation / Answer
An indicator follow the equation of pH= pKa + log[A-]/[HA]
The range of the indicator goes from pKa+1 and pKa-1, so if the pKa of an acid is 5 the pH of the range will be between 4 and 6.
Because we have Ka of 6,6*10^-5 the pKa= 4,2
So the range will go between 3,2 and 5,2
You should pick bromophenol blue.
With the other you have a Ka of 5,68*10^-10 and the pKa is 9,25 so the range is 8,25 and 10,25.
So you should pick thymol blue.
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