A student took the partial pressure of CO_2 gas to be equal to atmospheric press
ID: 484017 • Letter: A
Question
A student took the partial pressure of CO_2 gas to be equal to atmospheric pressure. Explain if this error will lead to an incorrectly high or low experimentally determined mass percentage of NaHCO_3 in the Alka-Seltzer. Consider the following error when answering parts a-c below: A student left the leveling bulb clamped to the stand, so when the final buret volume was read, the water level in the leveling bulb was higher than the water level in the buret. a. Given this error, is the gas pressure in the buret higher or lower than atmospheric pressure? Explain. b. How is the volume of gas collected affected by the error described above? (Consider your observations when you raised and lowered the leveling bulb so its water level was higher or lower than the water level in the buret). c. Explain how the error described will affect the calculated experimental mass percentage of NaHCO_3 in Alka-Seltzer.Explanation / Answer
2. If a student took partial pressure of CO2 same as atmospheric pressure, the resulting NaHCO3 percentage would be much higher than the actual value as the CO2 percent originating in the reaction is lower than this value while equalizing for the atmospheric pressure.
3. If the level was not equalized,
a. The gas pressure in the buret is higher than atmospheric pressure which pushed the water up the level in the tube.
b. the volume of gas thus collected by the above error would be lower as the pressure reading would be higher, pressure and volume are inversely proportional to each other.
c. The final as percentage of NaHCO3 calculated by the given error in experiment would be lower as the volume is lower which makes the moles of gas lower and thus mass of NaHCO3 lower value.
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