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1. The sulfur dioxide present in air is responsible for the "acid rain" phenomenon. One can calculate its concentration by titrating against a standard permanganate solution as follows:
5 SO2 + 2 MnO4-1 + 2 H2O → 5 SO4-2 + 2 Mn+2 + 4 H+
How many grams of SO2 are present in a sample if 7.37 mL of a 0.00800 M KMnO4 solution is needed for the titration? Answer 9.45 x 10-3 grams
2. Calculate the molarity of (a) 6.57 g of methanol (CH3OH) in 150. mL of solution and (b) 10.4 g of calcium chloride in 220. mL of solution. Answers (a) 1.37 M (b) 0.426 M
3. Water is added to 25.0 mL of a 0.866 M KNO3 solution until the final volume is exactly 500. mL. What is the concentration of the final solution? Answer 0.0433 M
4. A 1.00 mL solution of a radioactive sample exhibiting 1.00 x 109 counts per minute is placed in a tank containing water, and the tank's water is stirred until the radioactivity is completely distributed. A 1.00 mL sample of the water is then removed and found to exhibit 5.00 x 102 counts per minute. What is the volume of the water in liters? Answer 2000 liters
5. Calculate the volume of 0.150 M HCl needed to completely neutralize 25.00 mL of 0.125 M NaOH. Answer 20.8 mL
Find out how many total moles of gas are produced If a sample has 2.10 mL of nitroglycerine (density = 1.592 g/mL) is detonated?
Naphthalene, C10H8, melts at 80.0 C. suppose the vapor pressure of the liquid is 10torr at 85.8 C and 40torr at 119.3 C and that the vapor pressure of the solid is 1torr at 52.6 C, Compute the vapor pressure at the Tmp.
Write a balanced chemical reaction for the formation of a free fatty acid from a soap molecule under acidic conditions. Why would the formation of free fatty acids inhibit the cleaning ability of the soap
a sample of sodium reacts completely with 0.142 kg of chlorine forming 234 g of sodium chloride. what mass of sodium
Consider the reaction H2(g) + Br2(g) 2 HBr(g), which is exothermic as written. What would be the effect on the equilibrium position of adding a suitable catalyst
The use of an FTIR Transducer has never become commonly used as a detector for HPLC because?
1. prior to placing a 5.158 g piece of metal into the graduated cylinder the level was 5.0 ml. after adding the metal
Derive the symmetries of the ligand σ orbitals for an octahedral complex. Draw the MO diagram for Cr(CO)6 showing σ bonding only.
Write a balanced chemical equation for the neutralization reaction upon which this titration is based, and indicate clearly which atom is being protonated.
C2H4 + 3O2 = 2CO2 + 2H2O if you start with 45 grams of ethylene (C2H4), how many grams of carbon dioxide will be produced.
(b) You can use Esys or Pe to find other components of system. From your results above, find the oxygen concentration in the lake bottom water.
What is the pH of a solution that contains 0.50 M H2CO3 and 0.50 M NaHCO3? (Ka1 = 4.3 X 10-7, Ka2= 5.6 X 10-11)
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