ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: cameron_15 on August 03, 2010, 06:07:59 pm
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What Have i done! I've calculated a % ionization of over 100% for a prac we did!
So the concentration of HCl used was 0.01M, the solution had a pH of 1.5 as measured by a pH meter...
When I calculate the % ionization, it comes out to be 316% :o
So uh, I say it's not possible? Did I break something :2funny:
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LOL just write you added the wrong amount of water in ur conclusion
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The problem is though, my friends got a similar result!
Maybe the pH meter was poorly calibrated...
Never the less, I'll run with the can't dilute an acid accurately story.
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pH meters are very sensitive, so are their calibrated buffer solutions. Unless they are very accurately calibrated with very clean buffer solution, you can get an error of up to pH +/- 1. So that pH=1.5 was probably calibrated by contaminated buffer, what you are looking at is a pH of up to 2 or 2.5, which is okay for 0.01M HCl.
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The problem is though, my friends got a similar result!
Maybe the pH meter was poorly calibrated...
Never the less, I'll run with the can't dilute an acid accurately story.
Run with the bolded part.
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Sure thing Mao. thanks for your help!