11/17/2011 The Preparation of Calcium Carbonate Purpose: To create chalk (calcium carbonate) and to find the percentage yield in order to see the amounts of anhydrous sodium carbonate and calcium chloride were used up. Also to see if there’s any alterations like mass differentials. Objectives: 1. To introduce the concept of “limiting factor” in a chemical reaction 2. To practice a. Writing a balanced equation b. Determining the number of moles of each reactant and product c. Deciding which chemical is the limiting factor d. Predict theoretical yield e. Determine actual yield f. Use error discussion Materials: * 2 beakers * 2 watch glasses * Stirring rods * Filter …show more content…
6. The precipitate may have not dried up properly making it so there was water adding weight on it. 7. Errors with reading the scales, beaker and etc. Observations: Mass of CaCl2 (g) | Mass of Na2CO3 (g) | Mass of CaCO3 (g) | % yield (%) | 3.98 | 4.00 | 3.20 | 89.14 | 4.00 | 4.00 | 3.02 | 83.72 | 4.00 | 4.00 | 3.01 | 82.70 | 4.00 | 4.00 | 3.15 | 86.54 | 3.94 | 4.00 | 3.34 | 93.87 | 4.00 | 4.00 | 3.20 | 88.88 | 4.00 | 4.00 | 3.33 | 92.50 | 4.00 | 4.00 | 3.24 | 90.00 | Mean of % Yield = (89.14 + 83.72 + 82.7 + 86.54 + 93.87 + 88.88 + 92.5 + 90 + 97.5) ÷ 9 = 89.41 % Error Range 97.5-82.7 = (89.41% - 7.4%)(89.41% + 7.4%) 2 = (82.01% – 96.81%) =7.4 Questions and Calculations: 1. Step six in the procedure is necessary because there maybe some left over solution left over in the filter and so we use the water to get rid of that excess solution which is leftover. Step six is also important because this 5 mL of water could make the left over precipitate release excess water in it making it so that the drying process is quicker. 2. Na CO + CaCl CaCO + NaCl m=4.0g m= 4.0g 4g of Na CO x 1 mol of Na CO 4g of CaCl x 1mol of CaCl 106 g of Na CO 110g of CaCl = 0.0377 mol = 0.0364 mol Excess
Aspirin Recrysalization Data Table Actual Mass (g) 0.41 Actual MP (ºC) 123-125 Expected Mass (g) 0.533 Expected MP (ºC) 135 Percent Recovery 77% Percent Error 8%
As a group, we obtained our salt mixture of calcium chloride and potassium oxalate, and weighed the mixture. We were able to make an aqueous solution from the mixture and distilled water. We boiled and filtered off the solution, leaving the precipitate. Once the precipitate was dried overnight, it was weighed and the mass was measured. Then we calculated the moles of the precipitate.
***Repeat steps 2-4 for each of the following: 5 mL of oil and 2 g each of cornstarch, sodium chloride, and sodium bicarbonate.
(0.074 mol HCl x 1 mol NaOH) / 1 mol HCl = 0.074 mol NaOH
3. When the anhydrous sample was rehydrated, only 93.4% of the sample could be recovered. This was because some of the mass of the sample remained stuck to the filter paper and could not be measured in the final mass calculation. This automatically resulted in less mass and did not allow for 100% of the mass to be recovered.
9. How many moles of NaOH would be needed to completely react with all of the excess HCl determined in problem 8?
Chemistry 11 Formal Lab Limiting and Excess Reactants Lab By Eunice Ng March 26, 2015 Lab Partner: Amy Zeng Introduction In every chemical reactions, there are always limiting reactants. The limiting reactants are the reactants that limit the amount of product that can be formed.
Hi I’m Calcium I have 20 protons, 20 electrons, and 20 neutrons. My atomic number is 20 and my atomic mass number is 40. My number of electrons in energy level is 20 and my energy level number is 20. Also the period number I belong in for the periodic table is 4. The discovery name is Humphry Davy and he was the one that made me. The year that I was discovered was 1808 and the country they decided to discover me was in England. My element symbol is Ca.
→ CaCO3(s) + NaOH Sodium carbonate and calcium hydroxide yields calcium carbonate and sodium hydroxide. This equation also in the Zeman Lackner method shows what happens when both aqueous solutions of sodium carbonate is mixed with solid calcium carbonate. H2O(l) + CO2(g) +CaCO3(s)→ Ca(CO)2(aq) Water, carbon dioxide and calcium carbon dioxide yields calcium carbonic. This equation shows what happens if too much carbon dioxide gas is added, the solid calcium carbonate reacts with the liquid water to produce an aqueous solution of calcium
Ca concentration of 3.7 mg/L, Mg concentration of 1.4 mg/L and a total hardness of 15
Calcium was discovered by Sir Humphry Davy at England in 1808. Calcium is a soft, gray metal. When it burns, it burns with a yellowish-red flame. When it is exposed to air, it develops a gray-white coating because it reacts with the oxygen in the air to form a coating of calcium oxide .Calcium comes from the Latin word calx meaning lime. Compounds such as lime were prepared by the Romans in the first century under the name calx. Literature dating back to about 975 AD notes that plaster of Paris is useful for setting broken bones. Other calcium compounds used in early times include limestone. Calcium metal was not isolated until 1808. After learning that Berzelius and Pontin prepared calcium amalgam by electrolyzing lime in mercury, Sir Humphry
The rate of reaction is the speed in which a chemical reaction takes place. In this case the chemical that made a faster reaction is Powder Calcium Carbonate. Calcium Carbonate is a chemical compound with the formula of CaCO3. It is a common substance found in rocks.
Calcium Carbonate (Tums), helps restore calcium levels in the blood, prevents osteoporosis and bone demineralization and helps with neuromuscular function. Can also be taken for dyspepsia. It is taken orally and the drug is distributed widely and excreted in the feces. Adverse effects include, hypercalcemia, drowsiness, lethargy, nausea and vomiting, decreased appetite, increased thirst and urination and dysrhythmias. It is not recommended for patients with V-fib, metastatic bone disease, hyperparathyroidism and hypercalcemia. Caution in patients with renal insufficiency and history of renal calculi (Adams and Urban, 2016, p. 1233).
5.1+ 4.6+ 4.7+ 4.7 + 4.7+ 4.8 + 4.3 + 4.2 + 4.6 + 4.3 + 4.3+ 4.6 + 4.8 + 4.5+ 3.8 + 3.6 + 3.8+ 3.5 + 3.3 + 3.3 = 85.5
The formula CACO3 is very common in natural such as limestone cave, animal’s bones. Normally, the cement production and agriculture have deployed this component. The formula CACO3 is utilized to enforce the strength of cement in the company. Increasing the strength is one of a good property of eggshell. The other one is raising a plant and garden. Most fertilizer companies produce a various type of fertilizer to blend calcium in their products for encouraging vigorous plant growth. calcium boost fro