After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40, a student found that her best fit linear line for FD&C Red 40 was y = 2,962x + 0.005. Her Kool-Aid sample had an absorbance of 0.685. If 0.543 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her 8-fl oz cup?

Q: The instructor reveals that the weak acid is hypochlorous acid, HOCl. The known Ka for HOCl is…

A:

Q: What volume of a 36.0 wt% HC1 (FM 36.458) solution must be diluted to prepare 1.000 L of a 0.100 0 M…

A:

Q: The following experimental data was collected by a student: 0.0020 M Fe(NO3)3 mL Trial 1234 Blank…

A: Given :-  . Kc = ?  -------------------------------------

Q: RMR (kcal/day) = (9.99 x 79.5kg) + (6.25 X 182.9cm) - (4.92 x 35) + (166 x 1)- 161

A: RMR is the resting metabolic rate. It is the amount of energy in calories burnt while resting and it…

Q: A 1.058-g sample of a copper unknown was dissolved in water and diluted to a final volume of 100.0…

A: The calibration curve equation is 8.58 M = A Given : Absorbance = 0.529 = A Hence 0.529 = 8.58 M…

Q: Suppose you are interested to extract most of the 5 grams of vitamin C dissolved in 100 mL of water…

A: The quantity extracted Qn = A(KDV1/KDV1 + V2)n Here Qn = amount of substance unextracted in n number…

Q: After determining the absorbance of several standards of known concentration, the trend line for a…

A: Given data :

Q: 5. (1) (ii) Ibuprofen (206.3 g/mol) absorbs at 255 nm and shows a molar absorptivity of 3010…

A:

Q: HCI Ba(NO3)2 K2CO3 ABNO3 KI Pb(NO3)2 HNO3 Na,SC 4 HCI Ba(NO No 3)2 reaction K2CO3 Evolution of gas…

A: According to our guidelines, I can only answer first three reactions because you have posted…

Q: How do I find the theoretical molarity?

A: The values are given as follows:

Q: A solution prepared by dissolving 25.8 mg of benzene (78.11 g/mol) in hexane (86.16 g/mol) and…

A: Given that  A solution prepared by dissolving 25.8 mg of benzene (78.11 g/mol) in hexane (86.16…

UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.