The energy profiles for four different reactions are shown. Which reaction requi

Question

The energy profiles for four different reactions are shown. Which reaction requires the most energetic collisions to reach the transition state? Ammonia (NH_3) acts as a weak base in aqueous solution. What is the acid that reacts with this base when ammonia is dissolved in water? a. none, there are no acids in pure water b. H_2O c. NH_4^+ d. trick question, because no acids are present, ammonia cannot act as a base e. oxygen that always is dissolved in water When [H^+] = 10 times 10^-7 M in water at 25 degree C, then a. pH = 1. b. pH = 10^-7. c. [OH^-] = 1.0 times 10^-7 M. d. [OH^-] = 1.0 times 10^-7 M. e. [OH^-] = 1.0 times 10^-7 M.

Explanation / Answer

48)

Activation energy is maximum for b

This is the energy difference between reactant and peak

So large energy is required in case b

Answer: b

49)

NH3 + H2O ---> NH4+ + OH-

Acid is H2O

Answer: b

50)

pH = -log [H+]

= -log (1*10^-7)

= 7

[OH-] = 10^-14/[H+]

= 10^-14/ (1*10^-7)

= 1*10^-7 M

Answer: c

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