Identifying an unknown base


This experiment will help explain how you can neutralize and identify one of two bases with and acid of any known acidity. By using Hydrogen Iodine (HI) which has a known concentration of Mollers, when the amount of acidity of the liquid matches the acidity of the base the color of the liquid will permanently change indicating that the neutralization is completed. This will teach us about how acids and bases interact with each other as well as learning the ways that we can use this in real life situation when looking to see identify a base or acid.

Safety Equipment and Procedures

  • Goggles- To protect the conductors eyes in case the chemicals are put on there face.
  • Beret- To have a safe place to place the sodium hydroxide and measure how much liquid was used.
  • Eurbanmyer flasks- To have a secure spot for the base and a label to see how much liquid is in the flask
  • Ring- To hold the beret secure so the conductor does not have worry about dropping and breaking the beret.
  • Apron- too cover the body in case of a chemical is spilled


  1. Place the beret on the ring and fill it with HI until it is full to the top.
  2. Take an eurbanmyer flask and fill that with 10 mL one of two bases (baking soda, sodium hydroxide)
  3. Drop the acid in to the flask until the liquid changes colors permanently.
  4. Find the amount of acid dropped into the base by looking at the beret and seeing how many mL were used.
  5. Wash out the flask and beret well with water until clean.
  6. Use the equation Va x Ma = Vb x Mb (See video below for more help) 1M for unit
  7. Identify which base it is by using the aforementioned equation and using a chart to see which line up.
Chemistry 12.6b Calculating Titrations