Solutions of Acids and Bases

• When your press "New Problem", a window will appear with a question relating to a solution of a weak acid or base. Make sure that you read the question carefully.
• Calculate and submit the required value of produced by the weak acid/base approximation. Then press,"Check Approx".The results appear on the main screen. If you get it correct, proceed, otherwise, recalculate and resubmit.
• Once the approx. value is correct, determine whether the approximation is a valid answer and click on either "Yes" or "No" accordingly. Again, if you get it incorrect, you must resubmit before you can proceed.
• You only do the third stage if:
  • You have gotten the first two parts correct and
  • The approximation is invalid
  If those conditions are met, then calculate the exact answer and submit it.