Homework Answers
if the crucible and lid is really hot, it might be heating the air around it, and will cause convection currents, which will make a very small amount (i.e. milligram) of reading unstable.
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QUESTIONS Why do the crucible and lid need to be cooled before weighing? Be specific. 1....
Explain how each of the following would affect the percent sulfate you calculated, i.e., too low,...
Explain how each of the following would affect the percent sulfate you calculated, i.e., too low, too high, no effect. Be specific. 3. You added 15 mL (instead of 10 mL) of 0.25 M BaCI, to your unknown. a. You were in a hurry to get out of lab, so you did not rinse the last traces of solid BaSO, from the reaction beaker into the funnel. b.
1. The crucible is not fired, as the procedure suggests. The mass of the dirty crucible...
1. The crucible is not fired, as the procedure suggests. The mass of the dirty crucible is recorded. However, the impurities are burned off in the experiment. Will the reported mass of the final product be too high, too low, or unchanged as a result of this technique error? Too high Too low Unaffected 2. If you put more water than is needed for reaction 3, and then did not dry out this excess water, what effect (if any) would...
During the cooling of a fired crucible, water vapor condensed on the crucible wall before the crucible's mass was measu...
During the cooling of a fired crucible, water vapor condensed on the crucible wall before the crucible's mass was measured. The condensation did not reoccur following thermal decomposition of the hydrated salt in Part B. Will the reported percent water in the hydrated salt be reported too high, too low, or just right? a. too high- the calculated mass of the crucible is so high the calculated mass lost is also high, producing a high % water. b. just right-...
Post lab Questions: 1. While performing the formula of hydrate laboratory experiment, the lid accidently slips...
Post lab Questions: 1. While performing the formula of hydrate laboratory experiment, the lid accidently slips over the crucible to completely seal the crucible. a. What effect this change will cause on your calculated experimental results? Explain. b. Would your calculated percent water of hydration be high, low or unaffected? Explain your answer. 2. A student was asked to identify a sample of unknown hydrate. Student was provided with the following experimental data. 3.51 g sample of the hydrate when...
=4.31% 17:369 Laboratory Questions Circle the questions that have been assigned. 1. Part A.2. A 20-ml...
=4.31% 17:369 Laboratory Questions Circle the questions that have been assigned. 1. Part A.2. A 20-ml volume of previously boiled, deionized water is added to the Erlenmeyer flask to prepare the sample for titration. Explain why this volume is not critical to the analysis. 2. Part A.2. Previously boiled, deionized water is unavailable. In a hurry to pursue the analysis, deionized water (not boiled) is added. How does this attempt to expedite the analysis affect the reported percent acetic acid...
pl#3 QUESTION 1 A mixture of 0.810g of BaCl 2.2H 2O and Na 2SO 4 produces...
pl#3 QUESTION 1 A mixture of 0.810g of BaCl 2.2H 2O and Na 2SO 4 produces 0.466g of BaSO 4, the limiting reactant in the reaction is Na 2SO 4. Calculate the percent of BaCl 2.2H 2O and Na 2SO 4 in the original mixture. QUESTION 2 Because of the finely divided nature of the Ba 3(PO 4) 2 precipitate, some of it passes through the filter and is not collected. How does this loss of precipitate affect the reported...
i need all answers Data Table 1: Titration of Vinegar with Sodium Hydroxide Vinegar Sample 1...
i
need all answers
Data Table 1: Titration of Vinegar with Sodium Hydroxide Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 Mass of Vinegar (6) Volume of Vinegar (ml) Density - 1.005 g/ml Initial NaOH volume in syringe (ml) Final NaOH volume in syringe (ml) Volume of NaOH delivered (mL) Volume of NaOH delivered (L) Molarity of NaOH Moles of NaOH delivered Reaction of NaOH with Acetic Acid Moles of Acetic Acid in vinegar sample Molar mass of Acetic...
i need all Post Lab Questions: type in your answers to the following questions Determine what...
i need all
Post Lab Questions: type in your answers to the following questions Determine what effect the following errors would have on the value for the mass percent water for your hydrate 1. The hydrate was not heated long enough to drive off all the water a. This error will increase decrease leave unchanged the mass in grams for the suminum Eproma after heating b. The error for mass of the aluminum dish Epsom salt after heating that you...
i need help with post questions, thanks Product Isolation After stirring the reaction for 5 minutes...
i need help with post questions, thanks
Product Isolation After stirring the reaction for 5 minutes and allowing the reaction mixture to cool (the reaction can be exothermic), remove the Claisen head from the conical vial. Slowly add 3 M HCl(aq) drop-wise. The solid may need to be broken up with a stirring rod or a pipet. Continue to add acid until the aqueous phase (bottom layer) tests positive with pH paper. Extractions can be done using the conical funnel...
Procedure 1. Obtain a power supply and two cables that have alligator clips at one end....
Procedure 1. Obtain a power supply and two cables that have alligator clips at one end. Also obtain two small pieces of insulated copper wire (approximately six inches, with a small amount of exposed wire at each end). 2. Completely Fill a 50 mL buret with 1 M sulfuric acid (to the top, not just the 0 mL mark). 3. Add 150 mL of 1 M sulfuric acid to a medium-sized beaker (250-400 mL). 4. Take a piece of insulated...
Explain how each of the following would affect the percent sulfate you calculated, i.e., too low, too high, no effect. Be specific. 3. You added 15 mL (instead of 10 mL) of 0.25 M BaCI, to your unknown. a. You were in a hurry to get out of lab, so you did not rinse the last traces of solid BaSO, from the reaction beaker into the funnel. b.
Post lab Questions: 1. While performing the formula of hydrate laboratory experiment, the lid accidently slips over the crucible to completely seal the crucible. a. What effect this change will cause on your calculated experimental results? Explain. b. Would your calculated percent water of hydration be high, low or unaffected? Explain your answer. 2. A student was asked to identify a sample of unknown hydrate. Student was provided with the following experimental data. 3.51 g sample of the hydrate when...
=4.31% 17:369 Laboratory Questions Circle the questions that have been assigned. 1. Part A.2. A 20-ml volume of previously boiled, deionized water is added to the Erlenmeyer flask to prepare the sample for titration. Explain why this volume is not critical to the analysis. 2. Part A.2. Previously boiled, deionized water is unavailable. In a hurry to pursue the analysis, deionized water (not boiled) is added. How does this attempt to expedite the analysis affect the reported percent acetic acid...
i
need all answers
Data Table 1: Titration of Vinegar with Sodium Hydroxide Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 Mass of Vinegar (6) Volume of Vinegar (ml) Density - 1.005 g/ml Initial NaOH volume in syringe (ml) Final NaOH volume in syringe (ml) Volume of NaOH delivered (mL) Volume of NaOH delivered (L) Molarity of NaOH Moles of NaOH delivered Reaction of NaOH with Acetic Acid Moles of Acetic Acid in vinegar sample Molar mass of Acetic...
i need all
Post Lab Questions: type in your answers to the following questions Determine what effect the following errors would have on the value for the mass percent water for your hydrate 1. The hydrate was not heated long enough to drive off all the water a. This error will increase decrease leave unchanged the mass in grams for the suminum Eproma after heating b. The error for mass of the aluminum dish Epsom salt after heating that you...
i need help with post questions, thanks
Product Isolation After stirring the reaction for 5 minutes and allowing the reaction mixture to cool (the reaction can be exothermic), remove the Claisen head from the conical vial. Slowly add 3 M HCl(aq) drop-wise. The solid may need to be broken up with a stirring rod or a pipet. Continue to add acid until the aqueous phase (bottom layer) tests positive with pH paper. Extractions can be done using the conical funnel...
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