A 40.00mL soln of 0.100 M NH3 is titrated with 0.110 M HCl. What volume of HCl is needed to reach the equivalence point and what is the resulting pH? (Kb of NH3=1.78e-5)
Suppose you were given samples of two different liquids. Describe how you would determine which one is more voliatile.
Difference between a weak acid and a strong acid
What is the difference between a weak acid and a strong acid? Cite an example of each.
Prepare a table listing sources of energy that may replace today's gasoline for our cars of tomorrow. List several advantages and disadvantages of each.
What, if anything, would you expect to observe if you put a. a strip of zinc metal into a solution of copper sulfate b. a strip of magnesium metal into a solution of copper sulfate c. a strip of copper metal into a solution of zinc sulfate d. a strip of copper metal into a solution of magnesium sulfate e. a strip of silve ...continues
Gases move from regions of high pressure to regions of low presssure. What force keeps the gases of the earth's atmosphere from diffusing into interplanetary space, where the pressure is essentially zero?
If a helium balloon breaks loose it rises into the atmosphere and at some point bursts. Explain why?
17. A certain material "X" has an ether/water partition coefficient, KD = 3.3. If 55 mL of 12 ppt aqueous solution is extracted with 6.0 mL of ether, how much X is drawn into the ether layer? 18. The amount of mercury in a freshwater stream is determined by flowing 500 m3 of water through a charcoal filter canister. The ch ...continues
22. A company produces vitamin B tablets tha claim to provide 100mg of riboflavin. A bottle is drawn from the stock, and one pill is determined to contain 100.9 mg(= +/-1.1mg) of riboflavin. A)How many samples are needed to confirm with 95% confidence that the pills contain AT LEAST 100 mg of riboflavin. B) How should ...continues
(See attached file for full problem description) --- 23. In developing a fluorometric method, you measure a standard Analyte at 3.00 ppm (w/w) in the matrix at three different pH values: 2,5,8. You then compare the effects of internal calibration by adding 2.00ppm Analyte to your matrix vs external calibration via pure sta ...continues
