Calculating the pH and ion concentrations on a Calculator (TI-83 or ...

Calculating the pH and ion concentrations on a Calculator (TI-83 or similar)

I. Problem type: given ion concentration, find the pH.

To obtain the pH of a solution, you must compute the negative log of the hydrogen ion concentration H+

Step 1: Enter negative value (-) Step 2: Enter Log (LOG) Step 3: Enter ion concentration value -Log( value Step 4: press enter.

Example: find the pH of a solution with a hydrogen ion concentration of 0.05 M, or 5.0 x 10-2 M

-Log(0.05) = 1.3. If the pH is 1.3, the solution must be acidic Problem variation: you may be given the hydroxide ion concentration OH- and are asked to find the pH. In this case you must first find the H+ using the ion product constant for water...

H+ OH- = 1.0 x 10-14

II. Problem type: given pH, find the ion concentration.

To obtain the ion concentration from the pH, take the inverse log (antilog) of the pH value. Step 1: Press the (2nd key) followed by the 10x (LOG) key Step 2: Enter the negative value of the pH. Step 3: Press enter. Example: find the hydrogen ion concentration H+ of a solution with a pH of 7.41. Inverse log of -7.41 is 3.9 x 10-8

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