the buret to an initial volume of 1.42 mL.  When the reaction is complete, you note the final volume in the buret at 16.74 mL. Then you complete a third trial.  You add 25.6 mL of hydrochloric acid solution to a clean flask and add the indicator.  You refill the buret with calcium hydroxide solution to an initial volume of 1.75 mL.  You note that the reaction is complete at a final buret volume of 16.97 ml. a) Write a balanced equation for the Neutralization Reaction that occurs in this lab. b) Create a data table for the data that you collected during the scenario above. c) Calculate the Molarity of the hydrochloric acid solution for each of the three trials.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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You are running an acid-base titration with hydrochloric acid and calcium hydroxide.  The calcium hydroxide is your titrant; it has a known concentration of 0.0891 M.  You have added 25.0 mL of the hydrochloric acid solution to an Erlenmeyer flask along with 2 drops of phenolphthalein (fee’-nol-thay-leen) indicator.  To begin your first trial, you fill a clean 50 mL buret with the calcium hydroxide solution.  Your starting volume is 0.25 mL. After the addition of solution from the buret, you see a color change in the flask, and the end point of the reaction is reached.  You note the final volume in the buret to be 18.75 mL.

You begin again for your second titration trial.  You add 24.8 mL of the hydrochloric acid solution to a clean flask along with 2 drops of indicator.  You refill the buret to an initial volume of 1.42 mL.  When the reaction is complete, you note the final volume in the buret at 16.74 mL.

Then you complete a third trial.  You add 25.6 mL of hydrochloric acid solution to a clean flask and add the indicator.  You refill the buret with calcium hydroxide solution to an initial volume of 1.75 mL.  You note that the reaction is complete at a final buret volume of 16.97 ml.

a) Write a balanced equation for the Neutralization Reaction that occurs in this lab.

b) Create a data table for the data that you collected during the scenario above.

c) Calculate the Molarity of the hydrochloric acid solution for each of the three trials.

 

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