Please explain which buttons to push on TI-36x solar calculator to find the pKa of benzoic acid. the Ka for benzoic acid is 6.5 X 10 to the -5th ? (Sorry I don't know how to type the exponents for you)
Office Equipment & Supplies - Texas Instruments - TI-36 X Solar Calculator
Answers & Comments
You need the [EE] key to enter powers of 10 exponents.
You need the change sign key [+/-] key.
You need the [LOG] key.
pKa: 6.5 [EE] [+/-] 5 [LOG] [+/-]
There are two change sign: The first (either before or after the exponent 5), the last is entered after you press the log key , so as to negate (make negative if result is positive, and make positive is result is negative) the value.
The result should be 4.1870866 or 4.19
Note: The [EE] key is RESERVED for powers of 10. To enter any other powers use the [Y to x] key. Ex: 5*5*5=5^3, 5 [Y to x] 3 [=]