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- Explain the differences between the following calibration methods and why they are needed. a) External standard; b) Standard addition; c) Internal standardWhat can labs do to reduce error in GC- ms??Calculate the standard deviation of the four trials below. Trial 1: 49.59 grams Trial 2: 51.25 grams Trial 3: 49.78 grams Trial 4: 50.19 grams
- A series of standards were analyzed which gave the following results SOLUTION % Transmittance 0 mL of 0.100 mg/mL Hg + 2 mL tinchloride in a total volume of 75 mL 100 1.0 mL of 0.100 mg/mL Hg + 2 mL of tinchloride in a total volume of 75 mL 81.3 2.0 mL of 0.100 mg/mL Hg + 2 mL of tinchloride in a total volume of 75 mL 63.9 3.0 mL of 0.100 mg/mL Hg + 2 mL of tinchloride in a total volume of 75 mL 55 5.0 mL of 0.100 mg/mL Hg + 2 mL of tinchloride in a total volume of 75 mL 35.1 How would you make a Beer-Lambert Plot with this information?This question is not an accredited question3. a. Briefly explain why internal standardization method is useful inanalytical chemistry?b. Why does a response factor of an instrument’s detector need to becalculated?
- Solve for no.2 only ps. Not graded activity.You determine the acetic acid (HOAc) content of vinegar by titrating with a sodium hydroxide standard solution to a phenolphthalein (an indicator) end point. An approximately 5-mL sample of vinegar is weighed on an analytical balance in a weighing boat and this is found to be 5.0268 g. The standard deviation in making a single weighing is 0.2 mg. The sodium hydroxide must be accurately standardised (this means its concentration must be accurately determined) by titrating known mass of high-purity potassium hydrogen phthalate, and three such titrations give molar concentrations of 0.1167, 0.1163 and 0.1164 mol L-1. A volume of 36.78 mL of sodium hydroxide is used to titrate each sample. The standard deviation of the burette used is 0.02 mL. Calculate the percentage of acetic acid in the vinegar and its standard deviation.Calculate the standard deviation of the data below. 2.4 ppm, 2.1 ppm, 2.1 ppm, 2.3 ppm, 1.5 ppm
