Write a short note on how to perform 3 point calibration for a pH meter.
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Write a short note on how to perform 3 point calibration for a pH meter.
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- Two students independently determine the volume of water delivered by a 10.00-mL pipet. Each student takes 8 measurements, then computes the average volume delivered and the standard deviation. The results are tabulated below. Average St. Dev. Student A 10.4 mL ±0.7 mL Student B 10.00 mL ±0.02 mL Which statement best describes the results? 1)A: good precision, poor accuracy. B: poor precision, good accuracy. 2)A: poor precision, good accuracy. B: good precision, poor accuracy. 3)A: poor precision, poor accuracy. B: good precision, good accuracy. 4)A: good precision, good accuracy. B: good precision, good accuracy. 5)A: poor precision, poor accuracy. B: poor precision, poor accuracy.It is possible to make a perfectly precise measurement?Explain.To determine the cfu/ml of a pondwater sample, you perform 1/10, 1/100, 1/1000 and 1/10,000 serial dilutions and plate 0.1 mls of each dilution. You count 40 colonies on the plate derived from the 1/10,000 dilution. What is the cfu/ml of the pondwater? Show your work and use scientific notation.
- A 46.60-gram pycnometer was filled with 100.50 grams of liquid. When filled with insoluble powder, the pycnometer weighs 84.60 grams. When the insoluble powder and liquid were combined, the pycnometer weighed 172.8 grams. What is the relative density of the insoluble powder? 2.1 2.6 3.1 None of the AboveMetric base for liquid In the metric system, the base unit of a liquid is the Multiple Choice O O kilogram. meter. All of the answer choices are correct. gram. liter.You are required to administer 40mg Propanolol Hydrochloride to your patient orally. The stock solution available is 50mg/5ml. How many millilitres would you administer? Please give your answer as a whole number Answer: ML Show Calculator < Previous
- You have a stock solution of 40% hydrogen peroxide. You need to make several dilutions for a calibration curve. Calculate how much volume of the stock hydrogen peroxide you need to make 50 mL of 11% hydrogen peroxide.Identify three factors that would make the reading of a co-oximeter unreliable.BSA Concentration (ug/mL) Abs 2000 2.25 1500 1.715 1000 0.915 750 1.156 500 0.714 250 0.082 125 0.086 25 0.082 Create a BSA standard curve Abs562=f[BSA] using a Scatter Plot representation in Excel.
- You wish to quantify your favourite compound in an experimental solution using spectrophotometry. First, you use standard solutions of your favourite compound to collect the following standard curve data. Calculate the slope of the line of best fit to two decimal places, and enter it in the box below the table. Standard curve data Conc (MM) 0.300 0.600 0.900 1.200 1.500 Abs 0.225 0.450 0.675 0.900 1.125 Next, you prepare an experimental sample by mixing 0.25 mL of the compound solution with 9.75 mL of distilled water. Calculate the dilution factor and enter it as a whole number (no decimals). Next, you read an absorbance of 0.72 absorbance units for the diluted sample. Calculate the concentration (mm) of the original solution of the compound. Round this answer to one decimal place. Previous Page Next Page MacBook Air Page 5 of 13A 46.60-gram pycnometer was filled with 100.50 grams of liquid. When filled with insoluble powder, the pycnometer weighs 84.60 grams. When the insoluble powder and liquid were combined, the pycnometer weighed 172.8 grams. What is the relative density of the insoluble powder?A calibration curve for the absorbance of an unknown is shown below. What would be the concentration of a sample with absorbance of 0.45. Give the answer with the correct unit.