In- Lab Guidelines (This is a guide to allow you to prepare your lab data sheets

Question

In- Lab Guidelines (This is a guide to allow you to prepare your lab data sheets so you can efficiently collect and record the data needed for each part of this experiment. Provide a space for observations of events, etc, that might affect your data. Record your data on the sheets and turn in the duplicate pages of your observations to your Instructor before you leave the laboratory period.) Current atmospheric pressure Current atmospheric pressure (provided by Instructor if in units other than torr) Inst 15otorr c pressure1Slo_ Sample I Sample 2 ID of sample Volume of buret below 50-ml. mark 5 mL Actual Buret reading of lH, ollected3.m ___e mL 7 'lo oC OC Temperature of water bath Vol. of H, in graduated portion of buret Difference in water mL 90 mm 705 mm Observations: (Did an air bubble get into the buret when you inverted it? Was there a sudden pressure change? Were bubbles seen escaping the buret? Did the piece of Mg become permanently lodged above the surface of the liquid and not react? Did your or your partner's hand touch the gas containing a portion of the buret before you finished your reading? Did the magnesium escape from the bottom of the buret? Did gas escape while you were unsticking the Mg from the side of the buret?) Experiment 131 Determination of the Mass of Magnesium Metal in a Sample 1

Explanation / Answer

1)

If P was lower, then there was less mol of gas than calculated, therefore, you will have the

mass = mol*MW

since mol real is less, and mol read is high, expec a higher mass than the real mass

2)

None, the buret has fixed volume, so won't change its volume with compression

3)

IF H2 escaped, then you will measure a lower Volume of H2, therefore, less moles of H2, and relate sto lower Mg which is false

4)

The volume will be wrongly read, therefore volume of H2, is less, and Mg is therefore less than real

5)

If you add vapor pressure, the equation has a higher pressure, therefore a higher volume which is false

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