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?

Nconcentration refers to the molar concentration of an ion in solution. it may be identical to, or greater or less than, the molar concentration of the compound containing the ion that was used to make the solution. for soluble salts, the molarity of a particular ion is equal to the molarity of that compound times the subscript for that ion. for example, 1 m of alcl3 is 1 m in al3+ and 3 m in cl−. 1 m of (nh4)2so4 is 2 m in nh4+ and 1 m in so42−. part a what is the concentration of k+ in 0.15 m of k2s? view available hint(s) nothing m m part b if cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? view available hint(s) if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion. part c a scientist wants to make a solution of tribasic sodium phosphate, na3po4, for a laboratory experiment. how many grams of na3po4 will be needed to produce 550 ml of a solution that has a concentration of na+ ions of 0.700 m ? express your answer numerically in grams. view available hint(s) mass of na3po4 n a 3 p o 4 = nothing g provide feedback