Ahydrogen electrode can, in principle, be used to monitor changes in the molar concentrations of weak acids in biologically active solutions. consider a hydrogen electrode in a solution of lactic acid as part of an overall galvanic cell at 25°c and 1 bar. estimate the change in the electrode potential when the concentration of lactic acid in the solution is changed from 5.0 mmol l-1 to 25.0 mmol l-1.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.