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1. Pretend you isolated 120 micrograms of lawsone. You prepare a solution for UV-Vis using 9mL of 10% acetone in hexane. Explain what is the concentration of the sample mg/L?
2. Pretend you isolated 120 micrograms of lawsone and you started out with 1.68 g of henna. Explain what is the amount in your sample of henna?
Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level
A student used a DCP solution (standardized to 9.94x10-4M) to analyze a sample of extract from 3.50g of solid food. The titration required 22.49mL of DCP. 91.75% of all the ascorbic acid in the food was collected in the extract. (MM Ascorbic Acid ..
A gas pressure of 2.0 atm is in a closed container. Indicate the changes in its volume when the pressure undergoes the following changes at constant temperature: a) the pressure increases to 6.0 atm. b) the pressure drops to 1.0 atm. c) the pressu..
The generic metal hydroxide M(OH)2 has Ksp= 6.64x10^-18. (Note: In this particular problem, because of the magnitude of the Ksp and the stoichiometry of the compound, the contribution of OH from water can be ignored. However, this may not always b..
how does the hammond postulate explaina. the greater selectivity for bromination vs. chlorination of an alkane?b. the
In the qualitative analysis of antimony, please assist with net ionic equations for Sb3+ with thioacetamide, Sb2S3 with NaOH, Sb2S3 with conc. HCL, and SBCl6- with H2C2O4 and thioacetamide.
Construct a Born Haber cycle for the formation of the hypothetical compound NaCl2, where the sodium ion has a 2+ charge. A. How large would the lattice energy need to be for the formation of NaCL2 to be exothermic
Calculate the pH of a buffer solution made by adding 10.0g of anhydrous sodium acetate (NaC2H3O2) to 100 ml of 0.100M acetic acid.
how many moles of calcium chloride, cacl2, can be added to 1.5 liters of .020 M potassium sulfate, k2so4, before a precipitate is expected? assume that the volume of the solution is not changed significantly by the addition of magnesium sulfate.
What is the final temperature in a squeezed cold pack that contains 50.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18 for the solution, an initial temperature of 27.0 C, and no heat transfer between the cold pack and the..
A chemist had a substance which was either X (m.p = 52 degrees Celsius) or Y (m.p = 110 degrees Celsius). He place the substance in a test tube and puts the test tube in a beaker of boiling water. The substance melted. Explain what is the substanc..
100 mL of 0.200 M HCl is titrated with 0.250 M NaOH .What is the pH of the solution at the equivalence point?Express the pH numerically.
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