Calculate initial concentrations added to the test tube. (Fe+3 and SCN-1) 5 mL of 0.002 M Fe(NO3)3, 2 mL of 0.002 M KSCN (mL) , and 3 mL of H2O. Is the initial concentration 0.002 M for both Fe+3 and SCN-1 or will the C1V1 = C2V2 equation need to be used? Fe and SCN are both the reactants of the reaction with FeSCN as the product being observed.
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Calculate initial concentrations added to the test tube. (Fe+3 and SCN-1)
5 mL of 0.002 M Fe(NO3)3, 2 mL of 0.002 M KSCN (mL) , and 3 mL of H2O.
Is the initial concentration 0.002 M for both Fe+3 and SCN-1 or will the C1V1 = C2V2 equation need to be used?
Fe and SCN are both the reactants of the reaction with FeSCN as the product being observed.
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- Use the calibration curve or linear regression equation to determine the concentration of FD&C blue dye No. 1 in Kool-aid. Food Coloring is 0.026 M in FD&C blue dye No. 1 7.5 x 10 -5 M is 29 mL -> 1000 mLYou 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.As part of an analytical chemistry laboratory course, a student measured the Ca2+ content in two water samples, city-supplied drinking water and well-supplied drinking water, using two different analytical methods, flame atomic absorption spectrometry (FAAS) and EDTA complexometric titration. The results of this experiment are given in the table as the mean Ca2+concentration (?¯) and standard deviation (?) in parts per million (ppm). Each sample was measured five times (n=5) by each method. Method City-Supplied Drinking Water (?¯±?x¯±s) Well-Supplied Drinking Water (?¯±?x¯±s) FAAS 57.57±0.68 ppm 64.77±0.70 ppm EDTA titration 58.32±0.96 ppm 65.62±0.97 ppm Method Comparison: For each drinking water sample (city and well), compare the Ca2+ content measured by FAAS and EDTA titration. Calculate the ? value for each sample. Do the methods produce statistically different results at the 95% confidence level when measuring the Ca2+content of the city-supplied drinking water? Do the…
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- Nick and Kel reacted 2.80g of NiCl2 x 6H20 with 7.00 ml of 4.00 M C2H8N2. They recovered 2.40g of product, [Ni(C2H8N2)3] Cl2. At the end, the filtrate was a dark blue solution. The litmus test on the filtrate solution left the red litmus paper unchanged in color. - NiCl2 x 6H2O + 3C2H8N2 yields [Ni(C2H8N2)3] Cl2(s) + 6H20 - Molor mass of NiCl2 x 6H20 is 237.69 g/mol - Molarity of C2H8N2 is 4.00 M - Molor mass of product,[Ni(C2H8N2)3] Cl2(s) is 309.90 g/mol based on the experiment described, what are answers for the question below the actual or experimenting yield is __2.40g______ the theoretical yeild is __2.89g___ (can someone show me how to caluculate to get this answer?)CHOICES: Increase, Decrease, No Effect and WHY 1. The actual concentration of the sodium hydroxide used in the calibration part of the experiment was lower than the stated value. However, the NaOH solution used in the determination of ΔHrxn was of the correct concentration. [magnitude of ΔHrxn] 2. The test tube used in the determination of the ΔHrxn for nitric acid was still wet with water. [ magnitude of ΔHrxn] 3. The actual concentration of the sodium hydroxide used in the calibration part of the experiment was lower than the stated value. [Ccal] 4. A wet pipette was used to transfer 10.00 mL of 1M HNO3 in the determination of ΔHrxn. [magnitude of ΔHrxn] 5. The thermometer and stopper were inserted to the test tube 5 minutes after adding the base in the calibration part. [Ccal]Calculate the estimated O2 cost of horizontal treadmill running (ml · kg−1 · min−1) for a 70-kg subject at 150, 200, and 235 m · min−1.