Friday 4/15/11

Friday during class we picked up pages 2-6 of the pH tutorial. We worked on pages 2, 3 and 4. These pages were all about how to tell the pH of something if you know the given [H+] and vice versa. In part one we learned how to predict the pH. If you have 1x10^-5 the predicted pH would be 5 and it would be an acid. If it was 1x10^-12 than the pH would be twelve and it would be a base. Part two we learned the inverse of it. If the given pH is 2 than the predicted [H+] would be 1x10^-2 and it would be a base. In part three we learned how to find the ph if the number x 10^x is more than one. You use your calculator, hit (-), than (LOG) and than enter your number, and than (-) and the exponent. Part 4 we learned the inverse of that, you use (LOG), (-) and than the given pH. Then we learned how to find if something is Neutral, Basic or Acidic just by looking at the [H+] and the [OH-]. If the [H+] is greater than the [OH-] than it is an acid. The reverse works in the opposite manner, respectively. Lastly we learned how to determine the pH of something if we know the pOH and vice versa. Basically, the two numbers need to add up to 14, so you can figure it out.