pH calculs

**MissCaro** · 03-27-2007, 08:39 PM

hmmm well i have an exam tomorrow about doing a lab on paper only... and i need to calculate pH with formulas and i wonder if anyone is geek enough to understand all that crap and teach me in the next 3 hours?

**Ruthvik2.0** · 03-27-2007, 08:42 PM

well ph is amount of h+ ions in a substance etc the ph of ur blood is 7 etc and i gotta look in my bio book to find more info did this shit 2-3 mmonths ago xD

the highest amount oh ph is 14 and lowest is 1

**MissCaro** · 03-27-2007, 08:49 PM

omg i know that you dummy boi.... i just need to know how to use Ca Va = Cb Vb and [H+] [OH-]= 10^14

in a situation like the following

so hmm .. for example... if i have to find the pH of a solution of NaOH of 0.04 g/L and if that base makes OH- ions for each molecules of NaOH(strong base

)and also (NaOH ->> Na+ + OH- ) .

P.S i hate translating french notions into english ones :P

**Ruthvik2.0** · 03-27-2007, 08:55 PM

use PH strips xD

**MissCaro** · 03-27-2007, 08:57 PM

pH strips?

**camaz0tz** · 03-27-2007, 08:59 PM

i would say ask lutz...but refer to my sig

Speed · 03-27-2007, 09:04 PM

:blink: for what grade is this lol

**MissCaro** · 03-27-2007, 10:42 PM

different school system... but im 17

**Warmen** · 03-27-2007, 11:45 PM

Shit I did that in my grade 11 chemistry last year but i can't remember how to do it.

Look in your textbook it's bound to be in there

**MissCaro** · 03-27-2007, 11:57 PM

we changed teacher 5 times in 3 months cuz our original teacher made a burnout... so all the stuff we saw it a hundred times faster -__-

**lutz** · 03-28-2007, 01:30 AM

well ph is amount of h+ ions in a substance etc the ph of ur blood is 7 etc and i gotta look in my bio book to find more info did this shit 2-3 mmonths ago xD

the highest amount oh ph is 14 and lowest is 1[/b]

Technically, no, you could have a negative pH and a pH of 15 or higher.

**lutz** · 03-28-2007, 01:35 AM

hmmm well i have an exam tomorrow about doing a lab on paper only... and i need to calculate pH with formulas and i wonder if anyone is geek enough to understand all that crap and teach me in the next 3 hours?

[/b]

pH is a logarithmic scale (so basically, 10^x power, where the D(x) = all real numbers).

Now, the "middle" of the pH scale is 7, the pH of water, which is considered neutral, and the lower on the pH scale you are, the more acidic; I believe lemon juice or something like that is a pH of 4 or something, and the more basic you are, the higher on the pH scale you are.

pH is the concentration of H+ ions in the solution, and to calculate you just do acid and base solutions, the concentrations of each H+ and OH-.

It's pretty simple; I remember very little... this is all 10th grade crap <_<