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- After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had a concentration of 4.692 x 10–5 M. If 0.132 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder? Report your answer as a percentage with two places after the decimal. Do not include the percentage sign in your answer. Pay attention to units. You are trying to find the mass percentage of red dye, so you need to know each variable in the equation in Appendix B. Note that the percent by mass equation should be multiplied by 100. There may be some useful conversion factors in the experimental procedure.A student failed to carry out all of the procedural steps when doing this experiment. Would the following procedural variations result in an experimentally determined %percent copper in brass? Would it be too low, too high or unaffected? Briefly justify your answer. a) the student did not use a dry beaker when obtaining the stock solution b) the student used a wet cuvette when determining the concentration of solution of unknown brass. c) the student used the wrong wavelength, 430nm, during the measurement of the absorbance of unknown brass solutionIf ethanol (density = 0.784 g/mL) were used rather than water (density =0.998g/mL) to determine the density of the irregularly shaped marble pieces in question 6, how would the results have been affected? Clearly explain your answer. Assume the marble pieces do not dissolve in ethanol. Also, state clearly by circling the correct phrase before your explanation, if the reported density would be higher, lower or the same as that determined in water. A) Circle the correct choice: The reported density would be higher, lower or the same as the density determined in water. B) Write your explanation below:
- In our first lab experiment we will be identifying metals by measuring theirdensities and comparing them to known values. Here at NJIT we have a very large and generouslaboratory materials budget, so all sorts of exotic and extremely valuable metals will be providedfor the experiment. Using the values listed below, determine the identity of the metal samples.If the density value determined is not amongst the values below then one of those cheapRutgers samples crept into our stock of metal samples and you should answer “unknown metal”.Note: volume measurements are not very exact. If your density determination is off by 0.1 or0.2 from the known value, that’s probably good enough for an identity. Table in image 4a. You weigh your sample and determine it weighs 71.8 grams. You put the sample into 15.6 mL ofwater and the total volume rises to 22.4 ml. What metal do you have?4b. You weigh your sample and determine it weighs 56.3 grams. You put the sample into 28.9 mL ofwater and the total…Classify whether the following is an Instrumental error, Method error, Personal error, Indeterminate error or Gross error and explain. A group of students are doing an analysis of copper in 1-peso coin. They were tasked to prepare standard solutions and weigh the analyte as the end-product of their experiment. Makisig forgot to calibrate the analytical balance before weighing. Only one trial was performed in the experiment. One member inadvertently recorded 29.90 mL instead of 19.90 mL volume. Marikit had very good precision but poor accuracy in her data. Volumetric flasks were placed inside the oven for drying before it was used. Trial 1 and 2 have values close to 30.0 mL while trial 3 gave 55.0 mL. The reagent used in determining copper was added incorrectly and gave a low yield.-If ethanol (S.G. = 0.790) were used rather than water in measuring the density of the irregular objects, how would that have affected the result? Explain. -When you were measuring the volume of the irregular solid you were told to stir to eliminate bubbles. If the bubbles were not eliminated, how would that affect the density? Explain. -Suppose the density of 65.0 mL of some liquid was found to be 0.748 g/mL. What would be the specific gravity of 45.0 mL of this liquid?
- 1. These are components of a sample that is of interest to the chemist, usually taken as a representative of a bigger sample.A. Aliquot portion B. Analyte C. Distillate D. Assay2. The Mercaptan content of household gas supplies is monitored continually to ensure that the gas has a sufficiently obnoxious odor to warn of dangerous leaks, what analytical method should be applied to ensure this feat? A. Gravimetric B.Spectroscopic C.Volumetric D. Electroanalytical 3. A branch of chemistry that deals on the analysis, techniques of instrumentation and data interpretation of experimental results.A. Physical Chemistry B. BiochemistryC. Analytical ChemistryD. Inorganic Chemistry4. It is a chemical classification that can be used for general procedures that require stringent quality specifications and a purity of ≥95%.A. Laboratory gradeB. ACS gradeC. Technical gradeD. Special purpose5.These are balances that have a maximum loading of 10 to 30 g with a precision of 60.01 mgA.…given your experience in mass determinations (Experiment 1) and with volumetric glassware (Experiment 2), which factor used in calculating the density - mass or volume - is likely to be measurable with greater precision?density of irregular solid mass of irregular solid 9.039 g initial volume 68 mL final volume 74 mL total volume displaced 6 mL what is the density of irregulatr solid?
- A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.55, 3.65, 3.14. What is the 95% confidence interval for the mean of the data, assuming(a) No prior information about the precision of the analysis?(b) s → σ = 0.056 mmol Ca/L?During a combustion test, the following observations (Table 2) were recorded. By using suitable examples, explain the findingsPlease answer this question as fast as you can please and tahnk you. I will afterwards write an wonderful review on solving the question. Thank you. You determined experimentally the density of a solution in triplicate. Considering the results what is the standard deviation of your results? Answer your question with the correct number of significant figures. The answer should be in units of g/mL Trial 1: 0.9991 g/mL Trial 2: 0.9984 g/mL Trial 3: 0.9996 g/mL