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- 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)what are the possible errors that could be encountered during the analysis?Suppose that in a gravimetric analysis, you forget to dry the filter crucibles before collecting precipitate. After filtering the product, you dry the product and crucible thoroughly before weighing them. Is the apparent mass of product always high or always low? Is the error in mass systematic or random?
- What are refractories? How are they classified?. Give examplesfor each type.When we need sample preparation for analysis? use your own words to writeD. Unknown Metal Ion Concentration1. Prepare the unknown. Describe the preparation for the solution containing the unknown concentration of themetal ion.Volume of unknown sample solution (mL) _____20.0_________Volume of diluted sample (mL) _____25.0_________2. Concentration of metal ion. Absorbance of metal ion in solution ____0.396__________ Concentration of metal ion from the calibration curve (mol/L) _____0.008_________Concentration of metal ion in the original sample corrected for dilution (mol/L) ______________Show your calculations to account for the dilution of the original sample.
- 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?Use the sample experimental data to calculate the mass of residue (BaCl2) Mass of pan 15.110 g 2. Mass of pan + sample before heating 17.452 g 3. Mass of pan + sample after heating 17.107 gWhat is the difference between a fractionation and a distillation?
- What is precipitimetry?On a balance mass an amount of potassium hydrogen phthalate (KHP) needed to neutralize approximately 12 ml of 0.1 M NaOH(aq), and completely transfer the KHP to a clean 125-ml Erlenmeyer flask. Record the mass of the KHP at least to The thousandth decimal place. please answereIt is a type of mixture with particles evenly scattered in a dispersed medium without settling down