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The common antilog is the shifted function of the "log" button (marked 10-superscript-x) and the natural antilog is the shifted function of the "ln" button (marked e-superscript-x). The log and ln buttons are both on the third row of the keyboard.
You calculate the pH with the relation pH=-log(c) where c is the
value of concentration in mol/L. ex: c[H+]= 3.57x10^(-6) pH: (-) [LOG]
3.57 [2nd][EE] [(-)] 6 [ ) ] Here you have 2 change sign key press
If you have the pH, and want to calculate the concentration
that yields that value of the pH you proceed as follows c= 10^(-pH) Ex
pH=8.23 c: [2nd][LOG] [(-) 8.23 [)]
General shortcut. If
concentration is of the form c[H+]= 1*10^(-a) where a is an integer
between 0 and 14, the pH is equal to the positive value of exponent.
Mol/L then the pH is just the positive value of the exponent, ie 5
because pH=-log(1.x10^-5) =- log1 -log(10^-5)=0 -(-5)=5 Above I use
the rule log(axb)=log(a)+log(b) , the rule log(a^b) = b*log(a)and the
facts that log(1)=0 and log(10)=1, the last being true if log stands for
log in base 10.
The logarithmic functions have inverse functions that happen to have specific names. Even if the log^-1 notation may found on textbooks you will not find it on claculators.
Natural Logarithms LN. The inverse function of the natural logarithm is the EXPONENTIAL noted e to the x or e^x. On calculators the two functions usually share the same physical key. For example, LN is accessed directly and e^x is accessed with
try switching the top button next to GT to rate,then enter your tax rate then % (8.25%) then switch the top button back to on (or whereever you had it set to) and hit the tax+ button. That worked for me. GO TEXAS!!!
I bought a classpad 300 plus but I dont know how to operate it. I saw some books for classpad 300 and I really want to buy some. However everytime I try to buy, there is always a classpad that goes with the books . Can I buy books for classpad with out buying a calculator anymore?