when a student weighed her piece of magnesium ribbion before it was weighed she
ID: 1045605 • Letter: W
Question
when a student weighed her piece of magnesium ribbion before it was weighed she observed that the ribbon had a thick coat of transit. the student ignored the tarnish and weighted the metal sample as directed Both parts, please and thank you !2. For each of the following experimental errors or mistakes in doing this experiment, what will be the effect upon the experimental value of the molar volume of a gas at STP? Will the reported value a) increase b) decrease or c) not change? IN EACH CASE JUSTIFY YOUR ANSWER WITH SEVERAL SENTENCES a. When the student determined the volume of the hydrogen in the eudiometer tube, the level of the meniscus in the tube was considerably higher than the meniscus in the graduated cylinder b. When the student weighed her piece of magnesium ribbon before it was weighed, she observed that the ribbon had a thick coat of tarnish. The student ignored the tarnish and weighed the metal sample as directed.
Explanation / Answer
The experimental volume of gas evolved will increase (more than expected), since the volume student measured is more than blank measurement, so the measured volume is more than the actual volume. The experiment volume of gas evolved will decrease (less than expected), since the actual weight of magnesium metal weighed is less than required. i.e. weight the student measures is of Mg metal and magnesium oxide, the metal content in MgO is less than pure metal.
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