What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Pb concentration is 6.37 10 M and the Mg" concentration is 1.47 M? Pb (aq) - Mg(s)– Pb(s) - Mg"(aq) Answer: The cell reaction as written above is spontaneous for the concentrations given: true or false

Test tube  Concentration (M) absorbance 1 0.0003 0.13 2 0.0006 0.27 3 0.0009 0.41 4 0.0012 0.59 5 0.0015 0.72 unknown solution 0.00054 0.26    graph are attached please check   The concentration corresponding to unknown absorbance is 0.00054.   Using the Absorbance of your unknown, determine the concentration of your unknown from the graph by interpolation. Include your unknown concentration in the data table.   and Was Beer’s Law obeyed? Explain your answer       please answer  1 and explain properly thank you all data arementioned

The concentration of methylene blue in the sample is estimated through (select the correct)   options:   refractive index measurement (refractometry).   turbidity measurement (turbidimetry).   absorbance measurement (spectrophotometry).   titration with 2% HCl solution.

What is the % transmittance when the absorbance is 1.67

can you explain what is happening in the graph attached? Figure 1: p-nitrophenol Absorbance Standard Curve

A calibration curve was created to determine the quantity of protein in a solution. The calibration curve has the form of a straight line with the equation ?=0.0182?+0.007 where ? is the corrected absorbance of the solution and ? is quantity of protein in the solution in units of micrograms (μg). Determine the quantity of protein in a solution that has an absorbance of 0.305. A blank solution has an absorbance of 0.060. The answer (Quantity of protein) should be in units of (μg)

The intensity of red light (680 nm) absorbed by a solution of green dye was found to be 1.59 V and the intensity of light when no dye was present (the blank) was found to be 2.75 V.  What is the absorbance of the solution of green dye? Type only the value in the answer field. Report  answer to three significant figures.

By using the following mentioned concentrations and their corresponding absorbance values prepare a standard curve in MS-EXCEL and write down the CURVE equation along with R2 value.  Next calculate the concentrations of proteins of two unknown samples from that obtained equation. The absorbance of the unknown samples are: 0.375and 0.197.

A purple solution is prepared by mixing 5.00 mL of the blue dye solution with 6.25 mL of red dye solution. The calibration curve for each color is provided. Measurement Result Measurement Blue dye stock solution (M) Result 0.1944 M Red dye stock solution (M) 0.2015 M Absorbance at 630 nm 0.00697 0.00193 Absorbance at 500 nm Calibration curve Calibration curve y=0.0682x y=0.0170x Part: 0 / 4 Part 1 of 4 Determine the theoretical molar concentration of each dye in the mixture. Round your answer to 3 significant digits. [Blue theoretical = M D [Red theoretical M X Part: 1/4 Part 2 of 4 Using the absorbance and calibration curve for each dye, calculate the experimental molar concentration of each dye in the mixture. Round your answer to 3 significant digits. [Blue] M Submit A Continue © 2022 McGraw I LLC. All Rights Reserved. Terms of Use | Privacy Center 12 W 10 O

A sample of explosives residue is dissolved in an appropriate solvent and is injected into HPLC. The column contains a non- polar stationary phase. The sample revealed three chemical compounds that are commonly present in homemade explosives. ТAТP DADP HMTD 1 2 3 4 5 6 7 8 Retention time (minutes) a) determine the retention time of TATP. b) which one elute first :DADP,TATP or HMTD? c) State and explain which compound is most polar. d) If you are investigating this terrorist attacks, state one way in which the information in the chromatogram would be useful.