Posted by **John** on Saturday, January 19, 2013 at 2:35pm.

I have a question about how to plug in numbers on my calculator (TI-30XIIS) to get an answer. How would I put in my calculator...

ln 1.00X 10-2 mol/L /1.65 X 10-2 mol/L

to get-0.501? I keep getting the wrong answer...

- Chemistry/Calculus -
**DrBob222**, Saturday, January 19, 2013 at 3:05pm
I don't know how the Ti-30 looks but I suspect you're having trouble with the exponents. So don't use them until you learn how. In the meantime you can do this.

Punch in .01 and divide by .0165 (in the usual manner) then hit the ln key. That will give you -0.50078.

- Chemistry/Calculus -
**John**, Saturday, January 19, 2013 at 3:49pm
Thank you, sir. However, I stillmust be doing something wrong because I am not getting the answer. My calculator will give me an error if I do it that way. On my TI-30 I punch in 2nd button, the hit Ln, then (1.00 X 10-2 / 1.65 X 10-2) and get 1.83...

- Chemistry/Calculus -
**DrBob222**, Saturday, January 19, 2013 at 6:14pm
I think you need to reverse that procedure. Punch in the numbers FIRST to get 0.606, then to the ln bit.

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