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- A mixture containing only KCl and NaBr is analyzed by the Mohr Method. A 0.3172-g sample is dissolved in 50 mL water and titrated to the Ag2CrO4 endpoint, requiring 36.85 mL of 0.1120 M AgNO3. A blank titration requires 0.71 mL of titrant to reach the same endpoint. Report the % (w/w) KCl and NaBr in the sample. [Answer should be 82.41 % (w /w)]Preparation of sodium standard solutions with concentrations of 10, 20, 40, 60, 80, 100 (ppm) in a volume of 100 ml for each solution. [using a 100 ppm reference solution prepared from a weight of sodium chloride in a volume of 1 liter]I have 250mL of a solution that is 0.100 M Fe(NO3). 0.100 M Cu(NO3)2 and 0.50 M Ca(NO3)2. I want to separate the metals. I have solid sodium carbonate (NaCO3), solid Na3PO4, and solid NaOH in the stockroom. a.) Which sild should I add to get the best separation b.) how much of the first ion precipitate is left in solution when the second ion begins to precipitate?
- the solubility of Ba(IO3)2 in a solution prepared by mixing 300 mL of 0.010 M Ba(NO3)2 with 200 mL of 0.10 M NaIO3 .(K.S.P=1.57X 10-9) is5. If 0.045 mg of Pb2+ was observed in 1.69 kg of solution what is the ppm?A pharmacist is conducting an analysis of 2.7 g sodium bicarbonate and titrated with 26.05 mL of 0.9987 N HCl. What is the potency or percent assay of sodium bicarbonate? Did it pass the USP requirement? ROUND-OFF TO 2 DECIMAL PLACES. Answer = _% Disposition (Passed or Failed) = _
- The distribution constant for X between n-hexane and water is 8.9. Calculate the concentration of X remaining in the aqueous phase after 30.0 mL of 0.200 M X is treated by extraction with the following quantities of n-hexane: a. one 40.0-mL portion. Concentration = b. two 20.0-ml portions. Concentration = c. four 10.0-mL portions. Concentration = d. eight 5.00-ml portions. Concentration = M Σ Σ Σ Σ5. A 300.0 mg sample containing Na,CO3, NaHCO3 and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 mL to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.A typical protein contains 16.2 wt% nitrogen. A 0.500-mL aliquot of protein solution was digested, and the liberated NH3 was distilled into 10.00 mL of 0.021 40 M HCl. Unreacted HCl required 3.26 mL of 0.019 8 M NaOH for complete titration. Find the concentration of protein (mg protein/mL) in the original sample.
- 6. The mass percent of KHP in an unknown salt sample was determined using both volumetric and gravimetric titration. Ten determinations using each method were performed: (You should be using Excel to solve for the required values) Volumetric (% KHP): 34.22 33.86 34.07 34.49 34.69 33.71 34.28 34.11 34.26 34.10Gravimetric (% KHP): 34.35 34.26 34.10 34.19 34.18 34.32 34.11 34.33 34.17 34.12 a) Do the two methods give similar standard deviations? b) Do the two methods give similar results for the mass percent of KHP at the 95% confidence level?An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO, free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 311 mL of the standard acid. What is/are the component/s of the sample? O Cannot be determined O NAHCO3 only O NAOH and Na,CO3 O NazCO3 only O NAHCO, and Na2CO3An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO, free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 31.1 mL of the standard acid. What is/are the component/s of the sample? O NazCO3 only NaHCO3 only O NAHCO3 and Na>CO3 NaOH and NazCO3 O Cannot be determined