on the y-axis vs Plot a graph of absorbance concentration on the x-axis in Excel. Then, fit your data to a straight line. Make sure to set the intercept to zero, then enter the slope of your best-fit line below.
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- Xanthurenic acid stock solution Absorbance 25 0.052 50 0.128 75 0.202 100 0.310 150 0.448 200 0.621 Plot a graph, from graph, y=mx (force the trend line to pass through origin since the blank with no xanthurenic acid was set to be zero absorbance) in which, y: Absorbance, x concentrationBeaker Wavelength of Maximum Absorption Absorbance at Maximum Wavelength Form of Indicator in Solution A 438 0.293 HIn B 594 0.812 In- If you wanted to determine the concentration of your indicator in solution, which form of the indicator (HIn or In-) would give more accurate results? Why?A 3.7145 g portion of disodium EDTA dihydrate (M.W. 372.24) was dissolved in enoughdistilled water of prepare 1.000 L of solution. A 100.0 mL water sample was adjusted topH 10 and titrated to the Eriochrome Black T end point with 11.23 mL of the EDTAsolution. When the pH of another 100.0 mL water sample was adjusted to pH 12 andtitrated with EDTA, 2.11 mL of titrant was required. Calculate the concentration of Ca(II)and Mg(II) in the water. Express the answers in mg/L of CaCl2 and MgSO 4 , respectively.
- 1.Determine the color of the indicator in a given condition: METHYL ORANGE IN AN ACIDIC ENVIRONMENT. 2.This is the measure of reproducibility of data within a series of results. 3.This is the chemical to be subjected to testing in titrimetric method of analysis. 4.Determine the type of assay employed for this substance: TARTARIC ACID 5.Determine the color of the indicator in a given condition: PHENOLPHTHALEIN IN AN ALKALINE ENVIRONMENT. Please help me answer this questions. the answers are on the image I attached3. Complete neutralization of 10 ml of phosphoric acid solution by NaOH 0.I N in the presence of phenol phthalein until the appearance of purple color (pH, = 9) 11 ml. of NaOH is consumed. (a) What is the concentration of phosphoric acid? (b) Calculate the indicator error. pk2.1 pK. - 7.2 pK - 124What recommendations can you give in titration of mixed alkali?
- The Merck Index indicates that 10 mg of guanidine,CH5N3, may be administered for each kilogram of bodymass in the treatment of myasthenia gravis. The nitrogenin a 4-tablet sample that had a total mass of 7.50 g wasconverted to ammonia by a Kjeldahl digestion, followedby distillation into 100.0 mL of 0.1750 M HCl. Theanalysis was completed by titrating the excess acid with11.37 mL of 0.1080 M NaOH. How many of thesetablets represent a proper dose for a patient who weighs(a) 100 lb, (b) 150 lb, and (c) 275 lb?Match the quantitative analysis to their applications in the Laboratory procedures Choices: Acidimetry Precipitimetry Complexometry RedOx reaction Alkalimetry 1. Cause of poisoning 2. Metabolic acidosis 3. Electrolyte levels in blood 4. Antimicrobial analysis 5. Drug testing in urineThe following results were collected for % sodium carbonate in asample: 4.2, 4.4, 4.9, 4.0, 6.4, 4.3 and 4.1%. The result 29.4% seemsquestionable, if the tabulated Q = 0.568, should it be retained orrejected?Select one or more:The value 6.4 should be omitted (rejected)The calculated Q = 0.625The value 6.4 should be retainedthe calculated Q = 1.6
- You have a sample of approximately 100 mg/L of calcium carbonate and the standardized EDTA has a concentration of 0.00085 M. If you only want to spend approximately 15 mL of the titrant and add 25 mL of sample in the Erlenmeyer flask, can you use it or should you dilute it? the sample?, how much? Solution: No, 29 mL would be needed to titrate the sample, you must dilute it approximately 1: 2. Taking, for example, 25 mL of sample and making up to 50 mL.ans asap In the use of EDTA as the complexometric titrant, at what pH value/s does Y4- become a major component of solutions? -At pH 1 -At pH 7 -At pH values lower than 10 -At pH values greater than 10What will be the appropriate pH of a buffer prepared by mixing 100 ml of 0.1 M Na2HPO4 and 100 ml of 0.1 M NaH2PO4? (For H3PO4, pKa1 = 2.1; pKa2 = 6.8; pKa3 = 12.5) Ans in 2 significant figures