Answer to Question #210591 in General Chemistry for isa

Question

A sample of flammable liquid is placed into an enclosed cylinder which is then fitted with a movable piston. Initially the cylinder contains a volume of 3.70 L. The sample is ignited producing gas and releasing 569.9 J of energy. To what volume will the cylinder expand to if it must expand against a pressure of 816.9 mmHg. Assume all the energy released is converted to work used to push the piston?

Answer 1

The reaction given:

H₂PO₄^-_(aq) ⇆ H⁺_(aq) + HPO₄^2-_( aq)

Here, H₂PO₄^- ion serves as a proton donor, while HPO₄^2- ion is a proton acceptor. In a PBS solution, Na₂HPO₄ dissociates into Na⁺ and HPO₄^2-. As a result, this molecule serves as a proton acceptor. In contrast, KH₂PO₄ dissociates into K⁺ and H₂PO₄^-. As H₂PO₄^- is a proton donor, KH₂PO₄ serves as a proton donor in a PBS solution.