This is about the gas law constant experiment done with a eudiometer. Please hel

Question

This is about the gas law constant experiment done with a eudiometer.

Please help me answer these post-lab questions!

1. What would be the effect (increase, decrease, no change) on the calculated value of R for each of the following? Explain your reasoning in each case.

a). The vapor pressure of water is neglected in the calculations.

b). Some of the hydrogen gas escaped out the bottom of the tube as it was being generated.

c). Some of the Mg broke loose and floated to the top of the tube, but eventually all reacted.

2. Why did we not record the amount of HCl used and include it in our calculations?

3. Are your results more accurate or more precise? That is, are they closer to each other than they are to the true and accepted value. Explain.

Explanation / Answer

Experiment of gas coolected in eudiometer by reaction of metal with acid.

1. Effect on calculated R by,

a) vapor pressure of water is negligible, the value of R calculated would be higher as the pressure value would be higher.

b) If some of hydrogen gas escaped, the volume of gas is lower, moles of gas would be lower, so R would be higher is this case.

c) If some of Mg broke looses and did not react initially but ended up reacting later, no change in R would be expected.

2. HCl is used in large excess and thus cannot be considered in caculation.

3. the results with H2 gas volume is more accurate than considering say amount of HCl in reaction for calculations.

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