Dr. Sweeney is research chemistry who recently discovered an old bottle labeled perchloric acid (HClO_4) in the back of his research laboratory. After verifying that the contents of the bottle were indeed HClO_4 Dr. Sweeney was interested in determining the concentration of HClO_4 in the bottle. To determine the concentration of HClO_4 Dr. Sweeney performed a titration using 20 mL of HClO_4 and phenolphthalein. Dr Sweeney determined that it took 24 mL of 0.040 M NaOH to reach the endpoint of the titration. What did Dr. Sweeney observe to indicate the endpoint in his titration?
Write the chemical equation that represents the chemical reaction that Dr. Sweeney was studying. What type of chemical reaction is this?
What is the concentration of HC10_4 in the bottle that Dr. Sweeney found?