An acid-base indicator has a Ka of 3.0×10-5. The acid form o...
An acid-base indicator has a Ka of 3.0×10-5. The acid form of the indicator is red and the basic form is blue. By how much must the pH change in order to change the indicator from 75% red to 75% blue?
最佳答案
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[H+]= Ka[acid]/[base]
75% red:[H+]=(3.0×10-5)(75)/25=9.0×10-5 pH=4.05
75% blue:[H+]=(3.0×10-5)(25)/75=1.0×10-5 pH=5.00
The change in pH is 5.00 - 4.05=0.95
