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High altitude balloons used by environment Canada to measure O3 levels in the atmosphere also use a similar idiometric titration where the iodine liberated is measured by back titration with sodium thiosulfate. In this case the iodine is generated by oxidation of iodide by ozone:
03 + 2I + 2H? I2 + O2 + H2O
If 10 000 L of air were bubbled through an acidic iodide solution (at stp) and was then back titrated with 19.4mL of a 1.2 x 10-4 M Na2S2O3 solution to reach equivalence, what is the concentration of ozone in that sample of air (in ppm)
what is the concentration of a nitric acid solution if a 10.00ml sample of the acid reqires 31.25ml of 0.135m koh for neutralization.
The density of helium gas at 273K and 1.00 atm is 1.76E-4 g/mL. What is the volume (in L) of a balloon containing 9.24 g of helium under the same conditions?
Determine the Volume of air and partial pressure of nitrogen, oxygen, water vapor and air
Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant.
What is the final concentration of (in M) 15.7 mL potassium hydroxide solution with an initial concentration of 1.553 M which is diluted with 15.6 mL of solvent? Assume the volumes are additive.
Calculate the pH of a buffer that contains 0.270 M hydrofluoric acid (HF) and 0.180 M cesium fluoride (CsF). The Ka of hydrofluoric acid is 6.8 x 10^-4.
For an ideal gas the pressure P, the volume V and the temperature T are related by the ideal gas equation of state, PV = nRT, where R is the general gas constant and n is the number of moles. Consider V as a function of T and P and show that dV is..
400 M formic acid (HCOOH) solution freezes at -0.758 degrees C. Calculate the Ka of the acid at that temperature. (hint: assume that molarity is equal to molality. Carry out your calculations to three sig figs and round off to two for Ka).
Calculate the number of grams of anhydrous sodium oxalate needed to prepare 250 mL of .04500 M sodium oxalate solution.
Predict the anode, cathode, and overall cell reactions when an aqueous solution of each of the following salts is electrolyzed in a cell having
a student mixes 5.0 ml 2.00 x 10-3 m feno33 with 5.0 ml 2.00 x l0-3 m kscn. she finds that in the equilibrium mixture
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 8.00 g of sodium carbonate is mixed with one containing 4.75 g of silver nitrate.
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