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Explain why Fe3+ is in large excess in the standardization procedure. Fe3+ + SCN- → FeNCS2+
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- Sample Physical Appearance 0.1 M Na2CO3 0.1 M CaCl2 Na2CO3 + CaCl2 mixture Part II filtrate + CaCl2Given the Ksp for Ag2CrO4 is equal to 1.20 x 10-12, calculate the percent error in your experimentally determined value for average Ksp (this will be an extremely large percentage – think about why).GRADED FORMATIVE ASSESSMENT 1. Complete the table below. Indicate the coefficient if needed. Condition Reactants Products Room temperature Sr H2O O2 H2O Mg MgO Higher temperature Room temperature Room temperature Be CaCl2 Н Ba H2SO4
- Color BEFORE adding Color AFTER adding Intensity of color AFTER adding FeCl3 Test Tube # FeCl3 FeCl3 #1 (salicylic acid) clear lilac 100% #2 (commercial aspirin A) clear slightly pink 50% #3 (commercial aspirin B) clear lilac 95% #4 (aspirin from your clear pink 20% synthesis above) #5 (control) clear clear 0% Based on this data and the melting point of Aspirin, how pure is the synthesized product?A water sample was analyzed for iron content using the iron-phenanthroline method. Using the set of data from Question 15 (as presented below), Reagent Blank Absorbance Absorbance (au) Reagent Blank Absorbance 0.003 Concentration of Stock Solution: 10 ppm Volume of Stock Solution (mL) Total Volume of Standard Solution (mL) 0.50 10.00 1.00 10.00 2.00 10.00 3.00 10.00 4.00 10.00 5.00 10.00 Volume of Trial Unknown Solution (mL) 1 5.00 2 5.00 3 5.00 find the true concentration of Fe2+ of the original sample. A) 5.12 ppm B) 2.56 ppm 2.52 ppm D) 5.05 ppm Concentration of Standard Solution (ppm) Total Volume of Unknown Solution (mL) 10.00 10.00 10.00 Absorbance (au) 0.012 0.132 0.267 0.349 0.428 0.560 Absorbance (au) 0.289 0.296 0.281A researcher reconstituted a vial of 750 mg Cefuroxime Sodium Powder for Injection with 6mL of sterile water for injection. The reconstituted solution was dark amber-colored solution. The package insert states that solution colors range from clear to yellow depending on concentration, diluent, and storage conditions. The researcher was then hesitant to give the patient the solution due to its unusual dark color. Five portions were taken from a batch of cefuroxime sodium. Prior to testing in the instrument, each part was subjected to one of the following conditions: Conditions Specifications Temperature Portion 1: 8°C ± 2°C Portion 2: 30°C ± 2°C Portion 3: 40°C ± 2°C Light Portion 4: Kept in the dark Portion 5: Exposed to direct sunlight 1. Of the several solutions prepared, which absorbance value results should be compared with each other to answer the questions of the pharmacist? Explain your answer.
- A | https://testing.illuminateed.com/assessment/603db30bc92e2ebd078b687b/604826708af909ba078b7b46/1?rldbqn: stry S21 UE8 (B) Al2 + Cu2Cl → Al2CI + Cu2 (C) Al + CuCl2 AlCu + Cl2 (D) Al + 2 CuCl → AlCl2 + 2 Cu Which of the following reactions is best represented by a double arrow ( because it only produces 6. aqueous products? (A) K2CO3 (ag) + 2 HCI (ag) 2 KCI + H2O + CO2 (B) K2CO3 (aq) + 2 NaCl (aq) → 2 KCI + NazCO3 (C) KOH (ag) + HCI (ag) → KCI + H2O (D) 2 KOH (aq) + CuCl2 (aq) → 2 KCI + Cu(OH)2 Which of the following reactants would produce iron (III) hydroxide, Fe(OH)3, as a precipitate in a double replacement reaction? 7. (A) NAOH (aq) + AICI: (aq) ate Education TM, Inc. DELL F2 F3 F4You find a separatory funnel set up in a fume hood. There are clearly two visible layers. Describe a method you could use to determine which layer is the aqueous layer. Saved Normal BII|U X2| X² | → EEE fx| ® | O If you had a mixture of butyric acid and hexane, how would you separate the two compounds? Saved Normal BIIIU X2| X² | → EEEWrite the expression for Kc for the reaction Fe₂S3(s) ➡ 2 Fe³+ *(aq) + 3 S² (aq) Kc = [2Fe³+1² [3S²-1³ O Kc = [Fe³+1² [S²-1³ none of the answers are correct O Kc = [2Fe³+] [3S2²]
- 2+ d. 4H3O+ (aq) + 2Cl(aq) + MnO₂ (s) ⇒ Mn²+ (aq) + 6H₂O(1) + Cl₂ (9) Oke O Ke = = O Ke = 2+ [Mn²+ ][C1₂] [H3O+] * [CI-1² [Mn²+][H₂O][C1₂] 2+ [H³O+][CI¯]²[MnO₂2] [Mn²+ ] [H₂O1] [C1₂] 2+ [H3O+] * [CI-1²[MnO₂]Table 2: Absorbance Values of Standards and Unknowns. Sample Blank Standard Solution 1 Standard Solution 2 Standard Solution 3 Standard Solution 4 Standard Solution 5 Water Sample 1 Water Sample 2 Phosphate Concentration (in ppm) Y17 0 ppm 0.02 ppm 0.04 ppm 0.08 ppm 0.16 ppm 0.32 ppm Freeman Lake 0.001 0.325 0.292 0.413 0.315 0.039 0.054 0.049 Absorbance at 2= 690 nm Calculations: 1. Construct a phosphate standard curve in Excel by plotting concentration (in ppm) on your x-axis and Absorbance (unitless) on your y-axis for your known solutions. Label the axes on the graph and provide the curve with a title. Use a linear trendline to generate a best fit line to your data. Label the graph with the equation and the R" value. Insert your labeled graph in the space below. XM (2022-23) Unit 1: Mole Concept, Unit 4 (FR) (Version 2) Assessment: Chemical Reactions 0.90 0.80- 0.70- 3 0.60 0.50- 0.40- 0.30- Absorbance 2. To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and some inert materials, solutions with known [Co²+] are prepared and the absorbance of each of the solutions is measured at the wavelength of optimum absorbance. The data are used to create a calibration plot, shown below. 0.20 0.10- 0.00+ ㅏ 0.005 0.010 34 0.015 Concentration (M) .04 co₂ 100- pertoc A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted with water to a final volume of 50.00 mL. Assume that all the cobalt in the ore sample is converted to Co²+ (aq). (a) What is the [Co²+] in the solution if the absorbance of a sample of the solution is 0.74 ? (b) Calculate the number of moles of Co²+ (aq) in the 50.00 mL solution. (c) Calculate the mass percent of Co in the 0.630 g sample of the ore. Answer…