Stoichiometry Question
The unknown metal sulfates are hygroscopic and will absorb water from air. The unknowns must thus be kept in desiccators to remove any absorbed water. How would your results be affected if your unknown sample was not desiccated? Would this error cause your calculation of the mass percent of sulfate in the unknown to be too high or too low? Explain.
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An unknown metal sulfate is found to be 55.66% SO42 by mass. Assuming that the charge...
An unknown metal sulfate is found to be 55.66% SO42 by mass. Assuming that the charge on the metal cation is +3, determine the identity of the cation 1. 2. The unknown metal sulfates are hygroscopic and will absorb water from air. They must thus be kept in desiccators to remove any absorbed water and keep them dry. How would your results be affected if your unknown sample was not desiccated? Would you obtain a hig her or lower mass...
QUESTIONS Why do the crucible and lid need to be cooled before weighing? Be specific. 1....
QUESTIONS Why do the crucible and lid need to be cooled before weighing? Be specific. 1. Assume that you failed to clean some grease off of your crucible before doing the percent water determination. If that grease then burned off during the determi- nation, explain how the percent water you calculated would be affected (i.e., to0 low, too high, no effect). Be specific. 2. Explain how each of the following would affect the percent sulfate you calculated, i.e, too low,...
Consider the following experimental error. When decanting, some undissolved Al remained in the reaction vessel. How...
Consider the following experimental error. When decanting, some undissolved Al remained in the reaction vessel. How would this error affect your theoretical yield of Cu? A) The Al did not react and will cause the amount of Cu to be too low, thus the theoretical yield will be erroneously low. B ) The mass of Al will make it look like there is more Cu than there actually is causing your theoretical yield to be erroneously high. C) This mass...
Determination of Ka and Identification of an Unknown Weak Acid Post-lab Question 1. Suppose that a student performi...
Determination of Ka and Identification of an Unknown Weak Acid Post-lab Question 1. Suppose that a student performing this experiment mistakenly calibrated the pH meter using pH 8 buffer instead of pH 7 buffer. As a result of this error, all of the student's pH readings were too low. a) Would this error have affected the calculated molar mass of the unknown acid? Briefly explain. b) Would this error have affected the experimentally determined pKa of the unknown acid? Briefly...
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...
For the Unknown Liquid, suppose the first three measurements (empty, w/ 5mL, and w/ had no...
For the Unknown Liquid, suppose the first three measurements (empty, w/ 5mL, and w/ had no major error, but then you chipped your cylinder and the mass was too low for 10mL the last 3 measurements (w/ 15mL, w/ 20mL, and w/ 25mL). Briefly explain whether this would cause your calculated density to be too High or too Low (think about slope).
If the stock iron standard solution was accidentally diluted while handling, would this error cause the...
If the stock iron standard solution was accidentally diluted while handling, would this error cause the reported concentration for the unknown to be high or low? In your explanation, first describe how (1 mark) the slope of the Beer's Law Calibration Graph would be affected.
8 Would your exper ould your experimental percent sulfate be high or low if your alum...
8 Would your exper ould your experimental percent sulfate be high or low if your alum sample had a soluble non-sultate writy, for example, water to prove your answer, do the following calculation. Assume that included in the weight of a sample of alum are 0.10 g of water. The total weight of sample is 1.20 g. Calculate the percent sulfate in the sample.
A Freezing-Point Depression experiment is done using 2 different test tubes to find the molecular weight...
A Freezing-Point Depression experiment is done using 2 different test tubes to find the molecular weight of an unknown mixture. Tube 1 consists of pure Lauric acid, and Tube 2 consists of Lauric acid + an unknown solute mixture. From the calculations of this experiment, the molecular weight of the unknown acid can be found. A) How would the loss of some Lauric acid from Test Tube 1 have affected the calculation of a molecular weight? Would the calculated molecular...
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...
An unknown metal sulfate is found to be 55.66% SO42 by mass. Assuming that the charge on the metal cation is +3, determine the identity of the cation 1. 2. The unknown metal sulfates are hygroscopic and will absorb water from air. They must thus be kept in desiccators to remove any absorbed water and keep them dry. How would your results be affected if your unknown sample was not desiccated? Would you obtain a hig her or lower mass...
QUESTIONS Why do the crucible and lid need to be cooled before weighing? Be specific. 1. Assume that you failed to clean some grease off of your crucible before doing the percent water determination. If that grease then burned off during the determi- nation, explain how the percent water you calculated would be affected (i.e., to0 low, too high, no effect). Be specific. 2. Explain how each of the following would affect the percent sulfate you calculated, i.e, too low,...
Determination of Ka and Identification of an Unknown Weak Acid Post-lab Question 1. Suppose that a student performing this experiment mistakenly calibrated the pH meter using pH 8 buffer instead of pH 7 buffer. As a result of this error, all of the student's pH readings were too low. a) Would this error have affected the calculated molar mass of the unknown acid? Briefly explain. b) Would this error have affected the experimentally determined pKa of the unknown acid? Briefly...
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...
For the Unknown Liquid, suppose the first three measurements (empty, w/ 5mL, and w/ had no major error, but then you chipped your cylinder and the mass was too low for 10mL the last 3 measurements (w/ 15mL, w/ 20mL, and w/ 25mL). Briefly explain whether this would cause your calculated density to be too High or too Low (think about slope).
If the stock iron standard solution was accidentally diluted while handling, would this error cause the reported concentration for the unknown to be high or low? In your explanation, first describe how (1 mark) the slope of the Beer's Law Calibration Graph would be affected.
8 Would your exper ould your experimental percent sulfate be high or low if your alum sample had a soluble non-sultate writy, for example, water to prove your answer, do the following calculation. Assume that included in the weight of a sample of alum are 0.10 g of water. The total weight of sample is 1.20 g. Calculate the percent sulfate in the sample.
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