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Indium is seldom found in lead-containing samples and thus makes a good internal standard for lead analyses. A 10.0 mL aliquot of a 1.00x10-4 M Pb(II) solution is added to 10.0 mL of a 1.00x10-4 M solution of In(III). The resulting currents, measured polarographically, are 0.485 and 0.873 mA for Pb(II) and In(III), respectively. Then, 2.00 mL of a 2.00x10-4 M In(III) solution are added to 10.0 mL of a sample and the currents for Pb(II) and In(III) are 0.186 and 0.504 mA, respectively. Assuming a linear response between current and concentration, calculate the concentration of Pb(II) in the sample by (a) neglecting the information provided by the internal standard, and
(b) taking the internal standard into account the correct answer is (a) 2.30x10-5 M, (b) 2.66x10-5 M <-- how to get these answer?
An aerosol can has a gas pressure of 133 kPa at 293 K. Calculate the pressure when the can is heated to 460 K.
the average kinetic energy of xenon and nitrogen gases is the same at the same abosolute temperature?
acetic acid has a Ka value of 1.8x10^-5. How many grams of NaC2H3O2 would have to be added to 100 ml of .1 M HC2H3O2 to prepare a buffer with a pH of 4.5?
A mix contains 0.540 mol He (g) , 0.420 mol Ne (g) , and 0.050 mol Ar (g). Placed in 1 Liter container at 25*C.
The formal charge on the P atom is zero and It is best described with three resonance structures.
Calculate the heat energy released when 29.0 g of liquid mercury at 25.00 C is converted to solid mercury at its melting point
A sample of molten iron occupies of a volume of 7.11 x 10-3 L. If the density of iron is 7.86 g/cm3, what is the mass of iron in grams in the sample?
A sample of helium gas initially at 37.0 degrees C, 785 torr and 1.50L was heated to 65.0 degrees C while the volume expanded to 3.24 L. What is the final pressure in atm.
Calculate the heat released when 1.95 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride.
Descrbe the pH of a buffer soluton consisting of 100mL containing 0.1M CH3COOH and 0.125 CH3COO-, both before and after the additon
the density of iron is 7.874 g/cm^3 at 300K. If iron forms a body-centered cubic lattice, what is the radius of an iron atom?
What weight of A would be removed from a solution of 21 g of A in 50 mL of water by a single extraction
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