Question 39

Estimate the pH of a solution in which bromcresol green is blue and thymol blue is yellow.

Question 38

A o.15M solution of a weak acid is 3.0% dissociated.  Calculate Ka.

Question 37

A solution is prepared by adding 50.0 mL of 0.050M HCl to 150.0 mL of 0.10M HNO3.  Calculate the concentration of all species in this solution.

Question 36

Which is a stronger acid, H2O or HNO2?

Question 35

Which is the stronger acid, HCl or H2O?

Question 34

Write the balanced equation for the dissociation of ammonium ion in water.

Question 33

Of the hydrogen allides, only HF is a weak acid.  GIve a possible explanation.

Question 32

At 5,000 K and 1.000 atm, 83.00% of the oxygen molecules of the sample have dissociated to atomic oxygen. At what pressure will 95.0% of the molecules dissociate at this temperature?

Question 31

A certain reaction has an activiation energy of 54.0 kJ per mole.  As the temperature is increased from 22 degrees Celsius to a highr temperature, the rate constant increases by a factor of 7.00.  Calculate the higher temperature.

Question 30

A first order reaction is 75% complete in 320 seconds.   How long does it take for 90% completion?