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Sample #1 has an absorbance of 0.300. Sample #2 is the same substance and has an absorbance of 0.600 using the same equipment. What is the relative concentration of the second sample?
The concentration of sample #2 is the square root of that of #1.
The concentration of sample #2 is that of sample #1 squared.
The concentration of sample #2 is half that of sample #1.
The concentration of sample #2 is twice that of sample #1.
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- 31. please disregard the shaded option 4. Answer properly.A solution of a dye with an absorptivity coefficient (ε) of 3.75 x 102 M-1cm-1 had an absorbance of 0.039 measured in a cell whose width is 1.00 cm. What is the concentration of the dye in the solution? a. 1.46 x 10-3 M b. 1.04 x 100 M c. 1.04 x 10-4 M d. 1.46 x 101 M2. Add the absorbance of your Part III solution to the graph. Llse the of best fit of your qraph to calcuate its line concentration. Concentraton vs Absorbance 1.6 con c: 0.003M 1.4 1.2 0.8 0.6 0.4 0.2 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 Concentration Co.003M) Concentration you have calculated in 2 is CCrO, of Ag CrO4. calculate your experimental ksp of Ag CrO4. = [Cr O4]? Use it to 2. %3D ksp of AgCr Oy = CAg+] [CrO4] Absorbance te Out
- Does absorbance increase or decrease as the solution concentration of the absorbing substance increases? A. stays the same B. decreases C. increasesA series of six solutions was prepared at the given concentrations. Sample AB C D E F Concentration (mM) 50 100 | 150 | 200 300 400 The absorbance of each solution was then measured using a colorimeter. Sample A B C D E F Absorbance 0.25 0.50 0.75 1.00 1.50 2.00 What is the concentration of the solution with an absorbance of 1.50? C = mMIf a solution has an absorbance of 2 you can be certain that the solution is highly diluted and needs to be concentrated all the statements are correct this is a reliable absorbance and downstream analysis can be done the solution is highly concentrated and needs dilution
- When using a spectrophotometer to measure concentration of a solution, which of the following absorbance readings would indicate the highest concentration? 1. 0.56 2. 0.32 3. 1.34 4. 1.28Table 1. pH of water samples Sample No. Water Samples pH 1 Tap water from household 6.59 2 Water from creek 7.35 3 Water from river 7.35 4 Unknown sample 7.00 Table 2. Absorbance of Samples Table 3. Calibration Curve Data* Sample No. Absorbance Absorbance 3- Concentration of PO4 Ions, ppm (1 pt each) 1 1.33 1.0 0.050 2 3.26 2.0 0.093 0.89 3.0 0.137 4 0.099 4.0 0.185 5.0 0.230 *Provided by the instructor II. Graph Determination of Phosphate Concentration 3- 1. Using Excel, plot the concentration of PO4* (x-axis) vs. absorbance (refer to Table 3) The olot must show the equation of the best-fit (or trend) line of the graph. Attach the graph belowem1.png chem3.png Part 3: Q9 Average absorbance Flask 8 Flask 9 Flask 10 Flask 11 Part 3: Q9 Flask 8 Flask 9 Flask 10 Flask 11 Part 3: Q10 Flask 8 Flask 9 Flask 10 Flask 11 Q Part 3 0.146 [Fe] -0.002mol/L 0.166 volume 5.00mL 0.215 0.294 [FESCN mol/L) ✪ 4.59* 10 5.18*10* 6.64 x 10 9.08*10* [Fe(mol/L) 5.00 x 10 5.00*10* Y=3362x -0.0083 R¹ 0.9993 5.00 x 10 5.00*10* (Amounts of flask 8 (9 - 11's values are in the spreadsheet) 1:1 Ratio so, Molarity of Fe(NO3))3 = 0.2M Volume of Fe(NO3))3 = 5.00mL 71% Moles of Fe³= Molarity x volume(L) Moles of Fe = 0.2M × 0.005L = 1× 10-³mole 68% [SCN ](mol/ 4 x 10-4 5 x 10-4 7*10* 1*10* الخا chem2.png Concentration of Fe³ 9, X = mole of Fe³1x10³ mole Volume 0.0054 Ⓒ 8, Average absorbance for solution 8 (same for 9 - 11) Average absorbance for flask 8 = sum of all absorbances / number of readings (0.145 +0.147 +0.148) 3 Using equation of calibration curve's line(slope) of best fit, the average absorbances of the unknown concentrations to determine…
- 7. please help me answer thisMultiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 48.A substance that has a high degree of purity and is used in direct standardization purposes: a. Analyzed reagent C. USP grade reagent b. Primary standard reagent d. Technical grade reagent 49. When a weak acid is titrated with strong base, the indicator used is a. Methyl red C. Titration not possible Methyl orange b. phenolphthalein d. 50.An organic compound that changes from one color to another at a certain pH is called: a. Indicator C. Standard solution b. Buffer d. Test solutionPlease answer number 1 asap. I really need this before 4. Thank you