How will temperature affect the spontaneity of a reaction with positive H and S? A. It will be spontaneous only at T = H/S.
B. Changing the temperature will not affect spontaneity.
C. A low temperature will make it spontaneous.
D. A high temperature will make it spontaneous.

Option A. Spontaneous only at T = H/S

Explanation:

At constant temperature and constant pressure, the change Gibbs free energy is defined as:

Δ G  =  Δ H  −  t Δ S

If the change in Gibbs free energy is negative, then the reaction will be spontaneous.

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when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.