Will the UV-Vis spectrometer be able to measure concentrations of 1.3 mg/L and less as per the action level of Cu2+ set by the EPA’s Lead and Copper Rule?
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- Will the UV-Vis spectrometer be able to measure concentrations of 1.3 mg/L and less as per the action level of Cu2+ set by the EPA’s Lead and Copper Rule?
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- Why is it essential that some undissolved Ca(IO3)2 remain in the solution to be measured?mix 500 ml of 0.1 M HCl solution with 300 ml of 2 M Ba (OH) 2 solution a) indicate the environment of the solution after mixing b) What color will the detectors, phenophthalein and litmus get?What conclusion can be derived from the following sentences regarding analytical methods: I. Classical methods (gravimetry and volumetric methods) are no longer useful in analytical chemistry. II. Volumetric methods do not require calibration if a primary standard is used as titrant. III. Instrumental methods are useful with analyte solutions that are less than 1.00 mM. IV. Classical methods yield high precision and accuracy at concentrations greater than 1.00 mM. What conclusion can be derived from the following sentences regarding analytical methods: Two statements are incorrect. All statements are correct. One statement is incorrect. Only one statement is correct. All statements are incorrect.
- For the analysis below, find one step within design of experiment, interpretation and calculation of the given situation that is not correct. Write the incorrect step, and state why it is not correct. Write how you will change the step to make it correct. Why do you think he made the mistake ? A student will use a solution containing the complex formed between Bi(III) and thiourea (which has a molar absorptivity of 9.32 X 103 L cm-1 mol-1 at 470 nm) for his thesis experiment (investigation of its optical properties). To know the concentration, he used a calibrated UV-Vis spectrophotometer and 1.00-cm cell , and obtained absorbance of 0.528. To determine concentration, he multiplied molar absorptivity by MM of thiourea complex (MM: 437.3 g/mol) and used Beer’s law. The concentration he obtained is 1.99 X 10-7 M solution.What is the function of masking agent in EDTA titration?All of the following criteria must be met for a titrimetric analysis to be feasible EXCEPT: Select one: a. Reaction between the standard and analyte must be known. b. There should be a substance for endpoint detection c. Reaction must proceed quantitatively to completion. d. Reaction between the reactants must be slow.
- A sample of anhydrous NaHCO3 (FM = 84.007) is suspected to be contaminated with either NaOH (FM = 39.997) or Na2CO3 (FM = 105.989). To verify the suspicion, a 0.7483 g sample was dissolved to prepare a 50.00 mL solution, and a 10.00 mL aliquot was taken to prepare a 100 mL solution, where 25.00 mL was analyzed using double flask method. If the sample requires 0.45 mL of standard 0.0125 N HCl to reach the phenolphthalein endpoint and 35.95 mL to reach the bromcresol green endpoint, calculate the percentage composition (in %w/w) of all the basic components in the sample.An analyte has an Rf value of 0. 75 What does that indicate about the solubility of the analyte in the mobile phase as compared to the stationary phase?In the conductivity test, _____________________ is going to result to a brightly lit light bulb. a. 70% v/v ethanol b. 1.0 M citric acid c. Mixture of 10.0 mL 1.0 M Mg(OH)2 and 10.0 mL 1.0 M HNO3 d. Glacial acetic acid
- You are attempting to analyze samples for the presence of opioids using TLC. Use the internet to find a suitable method. Give the stationary phase, mobile phase, and detection technique used in the method and the URL of the website where you found the information.1. A sample of an infusion was diluted 10 ml to 250 ml and then 10 ml to 200 ml. It was then analysed and was found to contain sodium at 0.789 mg/100 ml. Calculate the concentration of sodium in the original sample in %w/v. The sample was composed of a mixture of sodium lactate and sodium carbonate in equimolar amounts. Calculate the amount of sodium lactate and sodium carbonate in mg/10 ml of the sample (Na = 23, lactate = 89, carbonate = 60) 2. 0.641 g of a semi-synthetic alkaloid was dissolved in 25 ml of 1% w/v acetic acid and was analysed directly by HPLC. The solution was found to contain 1.42 mg/100 ml of an impurity. What is the level of impurity in % w/w and ppm? 3. Calculate the pH of a buffer system made by dissolving 1.2 g of acetic acid and 0.82 g of sodium acetate in 500 ml of distilled water (pKa of acetic acid = 4.7) 4. Convert the following concentrations into the required expression. Concentration given Expression required 0.5% NaCl molarity 1 mM of KBr…Professor Forni has hired you as a research assistant and you need to make an X-gal staining solution for your sections containing 5mM potassium ferrocyanide, 5 mM potassium ferricyanide, 2 mM MgCl2, 0.1% Tween and 0.1% BCIP. You need 50 ml. As you are getting ready you discover that your colleague has used up all but 20 mg of the MgCl2.How much MgCl2 do you need to make 50 ml of X-gal staining solution? Do you have enough? Hint: we only care about MagnesiumChloride here. (MW MgCl2 is 95.21 g/mol)