Primarygun Posted July 16, 2005 Share Posted July 16, 2005 What's the possible lowest pH of HF, given the highest concentration is 27M ( molarity)? Link to comment Share on other sites More sharing options...
NeonBlack Posted July 16, 2005 Share Posted July 16, 2005 you'll need to know the ka. Link to comment Share on other sites More sharing options...
Primarygun Posted July 16, 2005 Author Share Posted July 16, 2005 It's known that it's a superacid, please estimate it for me. Link to comment Share on other sites More sharing options...
Yggdrasil Posted July 16, 2005 Share Posted July 16, 2005 According to my notes the pKa of HF is 3.2 Link to comment Share on other sites More sharing options...
Primarygun Posted July 16, 2005 Author Share Posted July 16, 2005 so what's the pH? Link to comment Share on other sites More sharing options...
NeonBlack Posted July 16, 2005 Share Posted July 16, 2005 I'm probably wrong, but I got about 0.88 Link to comment Share on other sites More sharing options...
Primarygun Posted July 16, 2005 Author Share Posted July 16, 2005 How about Ka=6.4? Link to comment Share on other sites More sharing options...
NeonBlack Posted July 16, 2005 Share Posted July 16, 2005 How about Ka=6.4? pH=1.1 ? Link to comment Share on other sites More sharing options...
Borek Posted July 16, 2005 Share Posted July 16, 2005 Check out the lecture: http://www.chembuddy.com/?left=pH-calculation&right=pH-weak-acid-base and example question: http://www.chembuddy.com/?left=pH-calculation-questions&right=pH-weak-acid-q1 pKa = 3.45 However, calculation for 27M solution will be not accurate, as the activities start to play important role. Try BATE to calculate pH. Best, Borek -- Chemical calculators at www.chembuddy.com pH calculation concentration conversion Link to comment Share on other sites More sharing options...
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