Names A student found the mass of a flask containing sulfuric acid to be 55.649

Question

Names A student found the mass of a flask containing sulfuric acid to be 55.649 g. She determined the mass of a beaker with potassium carbonate to be 43.948 g. She transferred the potassium carbonate into the beaker of acid and observed bubbling. She massed the flask and its contents after the bubbling stopped and found it to be 56.245. The mass of the beaker with the residual potassium carbonate was 43.073. Do her data support the Law of Conservation of Mass? Explain. What additional claims can you make about her data? Support your claims with evidence from the information provided and scientific theory. 1. 2. (a) When you place a 0.245 inch x 0.245 inch x 0.412 inch solid piece of platinum metal into a graduated cylinder partially filled with an unknown liquid, the total volume of the liquid with the platinum piece is 15.860 mL. The mass of the empty graduated cylinder is 35.635 g grams. The total mass of the graduated cylinder, the liquid, and the platinum is 54.896 g. The density of platinum is 21.45 g/mL. Determine the density of the liquid. Record your answer with the correct number of significant digits. Show all of your work. (b) This liquid does not dissolve in water nor does it react with water. Sketch what you will you observe if you add the liquid from problem 2(a) above to a 50 mL beaker that contains 25.0 mL of water. Explain your drawing. (c) What type of mixture, heterogeneous or homogeneous, will result when you add the liquid to water? Explain. (d) The liquid is a pure substance made up of carbon and hydrogen. Is the liquid an element, a compound, or a mixture? Explain.

Explanation / Answer

1.

The reaction in the beaker of acid will be K2CO3 + H2SO4 --> K2SO4 + H2O + CO2(g)

yes,law of mass conservation is applicable here also but the difference she has observed in the total mass is due to CO2 which is not in the flask as CO2 went out (bubble were produced because of CO2) as in the reaction we can see CO2 is produced.

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