Procedure I. Carbonate in the Limestone 1. Using a hammer (or other heavy object, break a piece of limestone into small pieces ideally, the pieces should have masses no greater than each. 2. Select one (or a few) pieces of limestone that have a total mass of g; record the mass s m L3. Add approximate of 3.00 M HCl to a clean and dry (important!) 125-mL Erlenmeyer flask. Record the total mass of the container with the HC1 4. Add the limestone to the flask with the HC the limestone should begin to dissolve with the formation of bubbles (production of CO2 gas). Allow the reaction to proceed until the mixture stops bubbling/foaming, indicating that the reaction is complete. 5. Record the final mass of the container remaining contents. Do not dispose of the solution-you will continue using this mixture for Part II 6. Repeat steps 1 to 5. This will give you two sets of data for Part I, and two samples to move forward to Part II II. Calcium in the Limestone gravity hltruhan For each sample from Part I solid 7. The limestone sample in Part I should have completely dissolved in the HCl solution. did not dissolve (impurities such as silicates, sulfides, and sulfates), one can carefull filter at this step and place the filtrate into a clean 125-mL Erlenmeyer flask for use in the rest of the tab s. Measure the mass of a clean and dry Gooch crucible together with a piece of filter paper placed inside the 76 Laboratory 7 Percent composition from Gravimetric Analysis: calcium Carbonate in Texas Limestone
Measure or calculate and record the following (in grams):
mass of the empty Erlenmeyer flask 1:
mass of the Erlenmeyer flask 1 plus the mixture sample:
mass of the mixture sample:
mass of the Erlenmeyer flask 1 and the remaining contents after drying of sand:
mass of Erlenmeyer flask 1 and dry sand
(2nd weighing)
Subtract (a) from (e) to obtain the mass of sand in the sample:
Measure or calculate and record the following (in grams):
mass of an empty Erlenmeyer flask 2:
mass of Erlenmeyer flask 2 and dry NaCl
(1st weighing)
mass of Erlenmeyer flask 2 and dry NaCl
(2nd weighing)
mass of Erlenmeyer flask 2 and dry NaCl
(3rd weighing) if necessary
measured mass of dry NaCl:
Assignment Questions (all work must be shown for all calculations):
Using the results of your lab, complete all the questions below.
Upload one picture that is representative of your experiment with this report to the appropriate D2L Brightspace Assignments folder.
Complete Data Table 1 located in the Procedure. Make sure to include all your work for all the calculations performed.
The amount of sodium chloride in the original mixture may also be determined indirectly by subtracting the SiO2 mass from the initial sample mass. Calculate the expected mass of NaCl using this method.
Calculate the percent difference of NaCl (Note: This is not % Error, but it is a similar calculation. This is an error calculation that checks precision between the results of the two methods from the following equation: (Note: the unit for this calculation is â% differenceâ)
% difference=measured mass-mass by subtractionmass by subtraction x 100
What is the mass percent of each component in your mixture: SiO2, and NaCl? (Note: the units for this calculation are â% SiO2â and â% NaClâ)
mass percent=mass of componenttotal mass of sample x 100
Error Analysis: Was your % difference from Assignment Question 4 within 10%? Why or why not? Did your two mass percentages in Assignment Question 5 add up to 100%? Why or why not? What were your biggest sources of error in this experiment? What would you do differently if you were to repeat this experiment? Explain.
What type of properties (physical or chemical) are we using to separate the mixture in this laboratory. Explain your answer.
A mixture is found to contain 0.69 g SiO2, 1.05 g of cellulose, and 2.17 g of calcium carbonate. What is the mass percentage of SiO2 in this mixture?
Assume you have a mixture of NH4Cl, sand, and salt and access to a regular chemistry laboratory. How would you separate the three?Write out what your procedure would be in numbered steps. Please research the answer to this question and properly cite your source. It is alright to research using the internet. However, Wikipedia, Yahoo Answers, Ask.com, and other non-scientific sources cannot be used.