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An unknown sample of Cu2+ gave an absorbance of 0.292 in an atomic absorption analysis. Then 2.00 mL of solution containing 100.0 ppm (= µg/mL) Cu2+ was mixed with 95.0 mL of unknown, and the mixture was diluted to 100.0 mL in a volumetric flask. The absorbance of the new solution was 0.462.(a) Denoting the initial, unknown concentration as [Cu2+]i, write an expression for the final concentration, [Cu2+]f, after dilution. Units of concentration are ppm.WebAssign will check your answer for the correct number of significant figures. [Cu2+]i
(b) In a similar manner, write the final concentration of added standard Cu2+, designated as [S]f .WebAssign will check your answer for the correct number of significant figures. ppm
(c) Find [Cu2+]i in the unknown.WebAssign will check your answer for the correct number of significant figures. ppm
The Ka value for acetic acid, CH3COOH (aq) is 1.8x10^-5 M. Calculate the pH OF 3.00 M acetic acid solution. Next, calculate the pH of the resulting solution when 2.501 mL of the 3.00 M acetic acid is diluted to make
What is the pressure in atmospheres inside a container of gas connected to a mercury-filled open-end manometer when the level in the arm connected to the container is 28.0cm higher than the level in the arm open to the atmosphere
What type of reaction mechanism will this reaction undergo with the 3,4-dimetyl-3-hexanol substrate (SN1, SN2, E1, or E2)? and show the products of the reaction
The temperature of the mixture is 0? , and the total pressure is 1.00 atm . How many grams of helium are present in the gas mixture? Mass of He =?
Reactant: water and 2.51 g of SbCl3 Product: 1.906 g of a solid of antimony, oxygen and chlorine, and 0.802 g of a single gas that is 97.20% chlorine and 2.75% hydrogen What is the empirical formula of the gas and the solid
Using curved arrows to show electron movement and bond formation write a reaction mechanism for the acid catalyzed reaction
A 15 L flask containing a sample of nitromethane is filled with O2 and the flask is heated to 100 celcius. At this temperture, and after the reaction is complete
Place drying tube filled with CaCl2 on condenser. Heat to reflux at 190 C for 25 minutes then cool. Add 0.5mL tolulene and petroleum ether 0.5-0.75 mL until slight cloudiness remains. Reheat until clear and cool in ice bath. Collect product and wa..
the compound sucrose is commonly known as table sugar. the chemical formula of sucrose is C12H22O11. How many hydrogen atoms are resent in 1.50 x 10^-4 mol of sucrose
The introduction state that often the rate doubles for each temperature increase of 10degree celcius. What value of the activation energy would cause the rate to double between 25~35degree celcius? ((k value)
An unkown metal crytallizes in one of the three cubic lattices. The edge length of the unit cell is 408pm. Given that the atomic radius of the metal is 144pm and the density of the solid is 19.3g/cm-3, what is the atomic symbol of the metal? a=2R ..
Balance the equations and indicate the type of reaction. CaO +HCl -> CaCl2 + H2O. and also, Fe + O2 -> FeO3.
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