David2010 Posted February 17, 2009 Share Posted February 17, 2009 Ok I am a sophomore in high school and we are working with a PH project. I have found enough information but I am kinda baffled at the formula and I cant ask the teacher for help. :-/ What would be the formula for measuring the PH (Acidity or basicity) of different solutes? And could you please explain it so somebody like me could understand it. xD I am terribly sorry if this is in the wrong section. Link to comment Share on other sites More sharing options...
DrDNA Posted February 18, 2009 Share Posted February 18, 2009 I'm not exactly sure what you are asking. Can you rephrase it? PS: You will probably have greater success if you post in the Homework Help section. Link to comment Share on other sites More sharing options...
Psycho Posted February 18, 2009 Share Posted February 18, 2009 pH = Log10 [H+] That means that pH 7 has 10x10^-7 protons per mole of solution, where as pH 8 would have 10x10^-8 which is 10x less, it is a log 10 scale, not a linear one. Link to comment Share on other sites More sharing options...
Kaeroll Posted February 20, 2009 Share Posted February 20, 2009 pH = Log10 [H+] That means that pH 7 has 10x10^-7 protons per mole of solution, where as pH 8 would have 10x10^-8 which is 10x less, it is a log 10 scale, not a linear one. Corrected: pH = -log10[H+] I'm not quite sure what the OP is asking? Link to comment Share on other sites More sharing options...
morganparkar Posted February 24, 2009 Share Posted February 24, 2009 Ok I am a sophomore in high school and we are working with a PH project. I have found enough information but I am kinda baffled at the formula and I cant ask the teacher for help. :-/ What would be the formula for measuring the PH (Acidity or basicity) of different solutes? And could you please explain it so somebody like me could understand it. xD I am terribly sorry if this is in the wrong section. hi, I will give the example how to calc pH. NaHCO3 + CH3COOH → CH3CO2Na + H2O + CO2 (gas) in the titration(note that this is pH titration not volumetric) of weak acid and a weak base a titration curve with no equivalence point is obtained so pH at endpoint is difficult to determine, the way out is to titrate the vinegar against a strong base and the baking soda against a strong acid .you would only get pH7 if u were using a strong acid (HCl) and a strong base (NaOH). if u were doing a titration of weak acid(acetic acid) and a strong base (NaOH) then the resulting pH is easy to determine. Link to comment Share on other sites More sharing options...
big314mp Posted February 24, 2009 Share Posted February 24, 2009 Well, in a nutshell, you need to find the proton concentration and plug that into the formula that kaeroll gave. Have you learned the ICE method? Use that to find the proton concentration. Link to comment Share on other sites More sharing options...
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