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1. What is a spectrophotometer used for in a cobalt chloride solution analysis?
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- What is polarity and how is polarity related to how chromatography works?1. Explain both precision and accuracy as they pertain to chemical measurements. 2. Why would you use the method of standard addition to calibrate a measurement instead of a calibration curve?1. Sketch and label the main parts of the mass spectrometer. 2. Give detail description about how it works.
- When we need sample preparation for analysis? use your own words to writeTrue or False?Why? In ion chromatography a single column containing ion exchange resin allows separating all major ions dissolved in water. *1. why is statistics itself is important in the field of chemistry especially in analytical chemistry? 2.Differentiate random errors from systematic errors. Give three examples each of these type of errors in titrimetric analysis.
- In a laboratory 100 mL of phosphorus solution with concentration 1,0 mg/L is needed when the spectrophotometer is calibrated. The solution is prepared in a 100 mL volumetric flask from the stock solution of phosphorus by diluting with water. The concentration of this stock solution is 50 mg/L. Calculate the volume of the stock solution needed.A student determined fluoride in a toothpaste sample using ion chromatography. A toothpaste sample of mass 0.100 g was dissolved in type I water and then quantitatively filtered through a Whatman #1 filter paper into a clean 100 ml volumetric flask. The flask was then made up to volume with type I water and mixed thoroughly.A portion of the solution was filtered through a 0.45 um filter into a sample vial for analysis. Analysis of the sample gave a fluoride concentration of 1.60 mg/l Calculate the % w/w fluoride in the original toothpaste sample. (Give your answer to 3 decimal places please)Assuming all other values are accurate, what would happen to the experimental value of Rif the Mg was not completely consumed? R=PV/nT
