Write three substances or species that can be determined using each of the following instrumental analysis techniques: 1- pH-measurement 2- Visible spectrophotmetry 3- Turbidity measurement Question: The mention includes three materials or factions that can be estimated for each of these mechanical analysis techniques.
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- A 1.5000-g sample of cereals was analyzed for nitrogen using the Kjeldahl procedure. The receiving flask contained 69 mL of 0.02 M HCl. After the ammonia was collected, the solution was titrated with 0 M NaOH, requiring 11.72 mL to reach the methyl red endpoint. Calculate and percent protein in the sample (f=5.70). Ans. in 3 SFsprovide an explanation of the graphs (a) and (b) the relationship of the biological activity of the drug with acid/base conditions (a) graph of the relationship between changes in pH and biological activity of weak acids and bases Weak Acid Weak Base Biology Activities pH (b) Relationship between antibacterial activity (Log 1/ C) against Escherichia coli and the pKa value of the sulfonide derivatives Log 1/C pkaThe following is an alpha plot for a monoprotic weak acid, HA. 1.0 CL 0.5 2 4 6 pH 8 10 12 14 HA A ►
- 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 concentrationDetermine the dissociation constants for the acids. Express the answers in proper scientific notation where appropriate. Acid A: pKa = 5.0 K₂ = a Acid B: pKa = 8.60 Ka = Acid C: pKa = -2.0 Ka =Question 1 0.3872g of an unknown weak acid with general formula HY, was dissolved in water and made up to a 500mL in a volumetric flask. The measured pH of the solution was 3.90. In a separate titration experiment, the K₂ of HY was determined as 100 x 10-6. The unknown acid HY underwent a series of chemical analyses to determine its structure. An infra-red spectrum of HY showed two main absorption peaks: a strong, sharp absorption at 1700 cm-¹ and a very strong, broad absorption from approximately 2700 - 3400 cm-¹. When reacted with a strong reducing agent, HY formed compound X. Compound X was then mixed with acidified potassium dichromate, producing an orange solution. When it was heated strongly, the solution turned green. A mass spectrum of HY contained two major fragments with m/z values of 43 & 45, respectively. b) Use all the information give above to deduce the most reasonable chemical structures for HY and X; and give the IUPAC names of both compounds. Credit will be awarded…
- mm 0.022 doidve of (41) bros Sibisconbydlo noitudo: M ILL 6. Classify each of the following as an Arrhenius acid (AA), a Arrhenius base (AB), a Bronsted-Lowry acid (BLA), a Bronsted-Lowry base (BLB), a Lewis acid (LA), and/or a Lewis base (LB). Select all that apply. Cact to nous dinoj Jusoraq silt ei ted You may need to draw the Lewis structure of some molecules to make this determination. The pKa of hydronium ion is -1.7. a. H₂O BLA LA BLB LB b. HI (pKa = -8) AA AB BLA BLB LA LB c. BH3 (pKa = ∞ BLA BLB LA LB d. NaOH AA AB BLA BLB LA LB e. CH3CH₂OH (pka = 16) AA BLA LA f. NC13 AA BLA LA AB BLB LB AB BLB LB g. NH3 (pKa = 39) AA AB BLA BLB LA LB h. F- AA BLA LA AB BLB LB1.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 attachedCalculate the [NH3] in a solution of 0.650M ammonium fluoride (NH4F). Hint: Use the Ka of HF (6.8 x 10 4) and the Kb of NH3 (1.8 x 10-5) to calculate Kc for the reaction NH4*(aq) + F(aq) = NH3(aq) + HF(aq).Report - Goog X >NGLSync Porta X OWLv2 | Online X [Review Topics] [References] Use the References to access important values if needed for this question. Retry Entire Group 8 more group attempts remaining a 65°F Scholarship Ap X ctivity.do?locator-assignment-take Ka for nitrous acid, HNO2, is 4.00×10-4. Ką for benzoic acid, C6H5COOH, is 6.40×10-5. Ka for hydrocyanic acid, HCN, is 6.20×10-10. What is the formula for the strongest conjugate base? Submit Answer (99+ # OF 4 8:56 E 5/28/2SEE MORE QUESTIONS