Question about Texas Instruments TI-84 Plus Calculator
I'm trying to calculate something for chemistry and the function I need to perform is the inverse log operation. To calculate the ph of a substance the formula is -log(value) but to calculate what i need to now I need to use an inverse log function and removing the - sign before the log key is not working. I have also tried the L1 function and it doesn't work either.
The problem is simple. You're trying to get an [H+] concentration which is obviously going to have a value of some number times ten raised to a negative power. Therefore, you have to insert the negative value of the pH into the 10^(x). When you insert said negative number you will come out with the right answer.
The pH of a sample of human blood was calculated to be 7.41. What is the [H+] concentration of the blood?
10^(-7.41) = [H+]
[H+] = 3.9 E-8
(the answer should only have two sig. figs because the pH has two digits after the decimal.
Posted on May 18, 2009
Okay, I've finally got this. Haha I've spent an hour messing around with my calculator & I'm pretty sure I know the answer.
If you have a TI-84, Press the 2ND button and the LOG button after (this will give you a small 10^( on the screen) and insert the ion concentration (for chem). You should get the answer that way.
So it would look like this:
Posted on May 07, 2009
If I understand you correctly, the inverse of the log operation is exponentiation. So if your log = x, the inverse is 10 raised to the x power. On most TI calculators this is on the same key as the log function.
Posted on Jun 13, 2008
Dude it's simple.
given something like [h30]=1.5x10^-3
- button, log button, 1.5 then shift button, log button (to get the 10x) then, the - button (if your integer is negative, then 3 then two parentheses.
so it looks like this:
answer should be 2.82 if not then you did something wrong.
Posted on Dec 07, 2009
Try this: (log(V)^(-1), and if that don't work, I'm stumped. :(
Posted on May 07, 2009
GIVEN [H] =3.8X10^-4 WHATS THE PH & POH &OH
Posted on Nov 07, 2011
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