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A soil sample was examined for lead. A 1.765 gram sample was microwave digested with 30mL of nitric acid. The resulting solution was quantitatively transferred to a 50mL graduated tube as well as filled to the 50mL mark. A 1mL aliquot of the diluted digestate was then added to a separate 50mL graduated tube and filled to the 50mL mark. The sample was examined by GFAA and found to contain 15 ppb of lead. Explain how many ug/g of lead are in this soil sample?
A 25ml solution of quinine was titrated with 1.00 M hydrochloric acid, HCl. It was found that the soluiton contained 0.125 moles of quinine. What was the pH of the solution after 50 ml of the HCl solution were added? Quinine is monobasic with pKb=..
419 kJ of energy is required to ionoze potassium. what is the minimum frequency of light required to ionize potassium
24.3 g of magnesium yield 40.3 g MgO upon combustion with oxygen. How much magnesium needs to be burned to yield 12.1 g MgO
Consider the following overall reaction which is experimentally observed to be second order in AB and zero order in C: AB + C ----> A + BC Determine whether the mechanism below is valid for this reaction.
what precipitate is formed when solutions of aluminum nitrate and calcium chromate are mixed? what mass of precipitate
a volume of 200mlk of nitrogen is collected over water at a temperture of 24 degrees celcius and the atmospheric
Formic acid, HFor, has a Ka value equal to about 1.8x10-4. A student is asked to prepare a buffer having a pH of 3.40 from a .10M HFor and a .10M NaFor solution. How many milliliters of the NaFor solution should she add to 20mL of the .10M HFor to..
Determine [Zn2+] [CN-] [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 2.390. The Ksp for Zn(CN)2 is 3.0x10^-16. The Ka for HCN is 6.2x10^-10.
Determine the freezing point of an aqueous solution that is 1,7 m in ethylene glycol. The freezing point depression constant for water is 1.86°C/m The freezing point of pure water is 0.0°C.
Which halide will react faster with sodium iodide in acetone: 1-bromobutane or 1-chlorobutane. Explain how the nature of the leaving group affects the rate of an SN2 reaction.
write structural formulas for the following condensed structures and determine the functional group in each compound.
A lab procedure requires 35.0 mL of a liquid. Which of the following glassware should be used to obtain the volume with the greatest number of significant figures: 50mL beaker, 100mL erlenmeyer flask, 250mL graduated cylinder, 50mL graduated cylin..
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