Chemistry-
General
Easy

Question

The amount of sodium hydrogen carbonate, N a H C O subscript 3 end subscript, in an antacid tablet is to be determined by dissolving the tablet in water and titrating the resulting solution with hydrochloric acid Which indicator is the most appropriate for this titration?

  1. Methyl orange, p K subscript l n end subscript equals 3.7    
  2. Bromothymol blue, p K subscript l n end subscript equals 7.0    
  3. Phenolphthalein, p K subscript l n end subscript equals 9.3 c    
  4. Alizarin yellow, p K subscript l n end subscript equals 12.5    

The correct answer is: Methyl orange, p K subscript l n end subscript equals 3.7

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