I need assistance calculating the results Rodri CZ. ASSIGNMENT 3 (Stoich 02) An

Question

I need assistance calculating the results Rodri CZ. ASSIGNMENT 3 (Stoich 02) An Analysis of a Mixture of Cao and Caco3 MATERIALS: A medium crucible dropper, concentrated and dilute unknown (bring a clean test tube) H2SO4, BE SURE TO WEAR PROTECTIVE GOGGLES. Both calcium oxide and calcium carbonate react with sufuria acid to form calcum sulfate you will convert a mixture of the two and, by the that you be n this experiment, sulfuric is highly corrosive It is best to handling the acids; the concentrated a ampened have a routine, such as to have the beaker containing the acid on burn you paper Any concentrated acid spilled will show up as a spot (the same kind of severe would get down recommend alternate procedures. instructor may leave Timing is important, you must have heated and cooled the crucible immediately before weighing. If you must debris the unknown be cover room to protect it from and put the crucible into a large beaker covered by a watch glass. EXPERIMENT Add to dua redness for a few minutes to remove volatile matter. Cool and weigh it accurately the 02g your unknown and weigh again. Record the masses writing in your data table ALL of the digits in balance display slowly Mount the crucible on a clay triangle s by your ron ring about into the hood. using a per, add mL M wise down the sides of the half way fume very and carefully add 20 drops of 18M (con) 20 M H2So4 is corrosive. If you get any yourself MMEDIATELY cover the Be CAREFUL! 18 flush with water for several minutes. must not the contents genty just under the boiling point of the to drive the Spattering crucible. occur. Some people find it more effective heat by the from above upon the rim ofthe As the water evaporates, the temperature will unti the begins to dense of These very and Continue to heat the ting must be removed through the fume hood. At this point, heat the until all excess acid has been decomposed and the dense white fumes no longer evolve crucibl the the dull red. Cool the crucible and weigh it the Add another 20 drops of 18 to cover the solid in the crucible and heat as above. ending wth to bottom ofthe being red. This wil take less time than since there is a volume of acid remove. Cool and weigh again. the recorded crucible and product agree within 5 gram, you are assured that all the sample has been Use the larger of aSO4 and crucible" in your calculations masses more than and the second the con means that has and that you may need to repeat with another sample Scrape and wipe out the does atter if some CaSO4 remains. Go back to the beginning of this section, the crucible again and same irections with a new sample of unknown, your to do After the results have been approved. clean the noted the next paragraph, and return it to the Wash the crucible with warm water. fill a mL with water, add 2-3 mL of dil HCI, and heat to five to ten minutes. Rinse and dry the crucible before boiling. Place the crucible in the solution and boil gently f returning it. CALCULATIONS Find the masses of sample and solid product for each trial. Calculate the mass of Cao in the sample. also the percentage Cao sample. Determine the percent deviation of the %Cao values, if you did two trials. Show the the instructor

Explanation / Answer

Here I need the theory used behind the experiment.

From the information provided above, I could reach to the following results:

The two reactions taking place are:

CaO + H2SO4 ----> CaSO4 + H2O

CaCO3 + H2SO4 ----> CaSO4 + H2O + CO2

Doing a stoichiometric analysis on the above two equations would help us determine the amount of CaO and amount of CaCO3 in the initial sample mixture.

But it has not been given how to differentiate between the two reactants from which CaSO4 forms.

Please provide the theory of the experiment and I will proceed further.

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