CH 116 lab 8

# CH 116 lab 8 - III. Experimental Results Trial Mass of...

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Gas Laws I. Experimental Procedure 1. Assemble the apparatus by clamping a long graduated pipet to a stand and attaching rubber hosing to the bottom of the pipet and an Erlenmeyer flask. 2. Add water to the pipet so that the level of the water was even with the height of the flask. 3. Cut an Alka Seltzer tablet in thirds and mass each portion. 4. Add about 50 mL of acetic acid to the Erlenmeyer flask. 5. Tie a piece of string around one tablet and use the stopper on the flask so that the tablet dangles above the acid. 6. Note the level of the water in the pipet and tip the flask so that the tablet is saturated with acid. Note the level of the water once the water has stopped decreasing. 7. Repeat for each tablet. II. Gas Leaks We knew that there were no leaks in our system because after the tablet stopped reacting with the acid and we removed it, the level of the water in the pipet rose to the same level that it was before the reaction.

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Unformatted text preview: III. Experimental Results Trial Mass of tablet Moles of NaHCO 3 (CO 2 ) % NaHCO 3 1 1.65 g 0.00087 4.42% 2 1.44 g 0.00074 4.34% 3 1.23 g 0.00068 4.65% The average percent sodium bicarbonate was 4.47% ± 0.16 IV. Wet Sample The mass of the tablet would increase if exposed to a high humidity atmosphere for several hours. The tablet would absorb some water, therefore making it heavier and altering the experiment. V. Partial Pressure of Water Dalton’s law of partial pressures states that the total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in the gas mixture. or where represent the partial pressure of each component We accounted for this law by using 1 atm in the equation to solve for the number of moles of CO 2 formed....
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## This note was uploaded on 06/15/2011 for the course CH 116 taught by Professor March during the Spring '09 term at University of Alabama at Birmingham.

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CH 116 lab 8 - III. Experimental Results Trial Mass of...

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