Which of the following statements are true of acids and bases? check all that apply. a. bases gain an oh- ion when in a solution. b. acids add h+ ions to a solution. c. bases add oh- ions to a solution. d. acids gain an h+ ion when in a solution.

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.