I just need help figuring out the values to do a calculation. Part of the lab relevant... "Prepare standards on the same day they will be used. Using a 100 mL volumetric flask, add x mL (vide infra) of the 0.050 mg/mL phosphate standard, 20 mL of th e molybdate-antimoney reagent, 1 mL of ascorbic acid, and dilute to volume with ultrapure water. Do this procedure for x = 0 mL, 1 ml, 2 ml, 5 ml, and 10 ml using volumetric pipettes. To be clear, we will be making 5 different solutions. The equation that was given was Concentration of initial standard (mg/mL) multiplied by volume added (mL) = concentration of created standard multiplied by volume of volumetric I dont need you to do the calculations, I just need help finding what values go in equation. we are trying to find the concentration of created standard

I just need help figuring out the values to do a calculation. Part of the lab relevant... "Prepare standards on the same day they will be used. Using a 100 mL volumetric flask, add x mL (vide infra) of the 0.050 mg/mL phosphate standard, 20 mL of th e molybdate-antimoney reagent, 1 mL of ascorbic acid, and dilute to volume with ultrapure water. Do this procedure for x = 0 mL, 1 ml, 2 ml, 5 ml, and 10 ml using volumetric pipettes. To be clear, we will be making 5 different solutions. The equation that was given was Concentration of initial standard (mg/mL) multiplied by volume added (mL) = concentration of created standard multiplied by volume of volumetric I dont need you to do the calculations, I just need help finding what values go in equation. we are trying to find the concentration of created standard

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.19QAP

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(Concentration) You are tasked to prepare 62.5 ppm of a caffeine standard for an analysis. You need to prepare 50.00 (±0.04) mL of this solution. However, you only have 50.00mL volumetric flasks available and a previously prepared caffeine solution using 0.0250 (+0.0003) g dissolved in 50.00 (±0.04) mL of water. You can use a 25.0000 (+0.0003) mL volumetric pipette to dilute your original solution in half every time. How many dilutions are you supposed to make to reach your target concentration? Write your answer using the appropriate number of digits. Note that the formula mass of caffeine is 194.194 g/mol with negligible error. Number of times to make a dilution: times
A student measures the following using a crude colorimeter. Intensity of blank =206 Intensity of solution = 168 What abosorbance value would the student report for the sample?
In the second test, you will prepare 10 mL of each solution containing 0.1%, 0.2%, 0.5%, 0.8%, 1%, 5%, and 10% H2O2. Explain how this will be done using a 10% stock solution of H2O2 to prepare the 5 % solution and a stock solution of 1 % H2O2 to prepare theremaining concentrations.
MAX OF 15 MINUTES A solution contains NaOH (FM = 40), NaHCO3 (FM = 84), and NazCO; (FM = 106), either alone or in a permissible combination. Titration of a 50 mL portion to a phenolphthalein end point requires 16.3 mL of 0.100 M HCI. A second 50.0-mL aliquot requires 38.2 mL of the HCI when titrated to a bromocresol green end point. %3D %3D What is the % w/w composition of the following? Express answers in two decimal places. If the component is not present, write 0.00 in the answer box. NAOH: NazCO3: NaHCO3: 96
How many grams of NaAsO, should be weighed out to prepare a stock solution of 100 mg/L in 500 mL deionized water. Use the stock solution to prepare 4 different standard solution that can be used to prepare an analytical calibration curve to measure the concentration of 750 sample in the concentration range of 10-35 mg/L. Draw a proposed calibration curve (based on the results you achieved).
Please determine how to make a working standard Solution of about 0.010mg/mL. Caffeine will be the active. Diluent will be water.
Atomic weights are not provided, but please use rounded-off values to the nearest whole number.(examples: 24.305, use "24"; 107.8682, use "108"; 1.00784, use "1"; 15.999, use "16") Final answer in 3 decimal places 1. A fat sample with combination free fatty acids required 8mL and 5mL of standard hydrochloric acid for blank and sample titration, respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value. 2. A 500mg oil sample is taken from a conical flask and is dissolved in 50mL distilled alcohol. An indicator is added and is then titrated against 0.112N KOH until a slight pink color appears. It took 17.6mL of the titrant to reach the endpoint. What is the sample’s Acid Value?
ASSIGNMENT 1 Problem solving: Kindly show complete solution and round off final in nearest 2 decimal point 2. A sample of Drug A weighing 0.2400 g was assayed by nonaqueous titrimetry using 27.8 ml of an acid with normality of 0.1125. Each mL of 0.1 N acid used is equivalent to 10.71 mg of Drug A>titer value. Determine the % purity of the sample.
Acrobat Reader File Edit View Window Help AChapters 14-15 Test 2020 2nd.pdf ne Tools Chapters 14 -15 .. x Q 1 4 日 2& 175% B. A solution is made by adding 16.00 grams of sodium acetate, NaC2H3O2, to enough water to make 800.0 mL of solution (Ka= 1.8 x 10³ for HC2H3O2 ). i. Write the balanced net ionic equation for the reaction that occurs. ii. Give the pOH. MAR 人
Methodology: Make schematic diagram for the procedure below B. % SO3 determination Dry the soluble sulfate sample at 100° C for 1-2 hours, and cool in desiccator. Weigh out 0.5 – 0.7 g (± 0.3 mg) duplicates sample. Transfer to 400-mL beakers. Dissolve each in 200 mL of dist. H2O + 4 mL of 6 m HCl. Precipitant is prepared by dissolving 1.3 g BaCl2 ∙ H2O in 100 mL water. Filter if solution is not perfectly clear. Heat the BaCl2 solution and sulfate sample solution nearly to boiling, and then add the entire amount to the HOT sulfate sample solution while stirring vigorously. Wash stirring rod with distilled water and include washings in your final mixture. Digest by letting stand 1-2 hours. Overnight standing is acceptable. Filter through an ash less filter paper of fine porosity (Whatman no. 42). Slowly pour the supernatant liquid through the filter paper.
Using a balance with a sensitivity of 4 mg, an acceptable weighing error of 5%, and cherry syrup asthe solvent for tartar emetic, how could you obtain the correct quantity of tartar emetic to fill theprescription?
From a 10-mL sample, a 1-mL aliquot was taken and diluted to 100mL. From this, a 5-mL aliquot was taken and diluted to 20mL.The final 20mL was found to have a concentration of 0.004M analyte X.What is the concentration of analyte X in the 10-mL sample?