Our labs this terms were intended to highlight concepts discussed in the book an

Question

Our labs this terms were intended to highlight concepts discussed in the book and the course recordings. They used simple compounds that could easily be obtained as home. a) What safety precautions should be taken when doing these experiments at home? None is not an acceptable answer though virtually any other well-reasoned argument may be accepted b) Considering the experiment measuring the pressure of the gases m the balloon Recall that you used vinegar and baking soda for that experiment and one of these was a limiting reactant. We measured the circumference of the balloon, using string. And approximated the balloon as a sphere to calculate the volume. I had you research the barometric pressure on the day of the experiment Now, I want you to give me a complete discussion of the experiment by answering the following questions. Be sure to give complete answers. i) Would it make more sense to have the vinegar or the baking soda as the Limiting Reactant. Explain. ii) Was the volume you calculated more or less than the actual volume of the gas produced? Explain. iii) How should the pressure you calculated compare to the atmospheric pressure that day? Don't answer how did it compare but how should it compare. Explain. iv) With these things in mind, what conclusion would you now make about your data?

Explanation / Answer

(i)

It will make more sense to have baking soda in excess and vinegar as the limiting reagent.

(ii)

The volume calculated was less than the actual volume because of the approximation that the balloon is a perfect sphere. But actually the balloon is somewhat oval which occupies slighlty larger volume than a sphere does.

(iii)

The pressure inside of the air balloon should be higher than the atmospheric pressure outside.

This is because the tension exerted by the balloon surface material adds to the inside pressure.

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