Blog

Which of the following is NOT an example of an ecosystem approach to biodiversity conservation?

Repeatability in an experiment is important because

Which of the following fossil fuels causes the least environmental problems?

A hybrid vehicle

Charles Darwin is generally credited with developing the concept of

What is the pH of the resulting solution if 25.00 mL of 0.10 M acetic acid is added to 10.00 mL of 0.10 M NaOH? Assume that the volumes of the solutions are additive. Ka = 1.8 × 10-5 for CH3CO2H

A 25.0 mL sample of 0.150 M hydrofluoric acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of hydrofluoric acid is 3.5 × 10-4.

Based on your prior understanding of equilibrium (Le Chatelier’s principle) explain why the percent ionization of a weak acid decreases as the concentration of the acid increases. Hint: think of the dissociation equilibrium of a weak acid, HA:

Calculate the concentration of H3O⁺ in a solution that contains 5.5 × 10-5 M OH⁻ at 25°C.  Identify the solution as acidic, basic, or neutral.

The following reaction is exothermic.  Which change will shift the equilibrium to the left?             2 SO2(g) + O2(g)  ⇌  2 SO3(g)