Question

Which of the following are accurate descriptions of buffer solutions? 1. If a solution is buffered, its pH is nearly neutral. II. The mechanism by which buffered solutions resist pH changes is not well understood. III. Addition of strong acid to a buffer shifts the equilibrium such that Ht is consumed. IV. If strong base is added to a buffer, it reacts with the acid component of the mixture. V. Buffers only work well if the one conjugate is present in substantially higher concentration than the other. a. I and II b. III and IV c. O IV and V d. O II and IV e. O I, III and IV

Answer 1

Solution :- Buffer is a solutions which resist change to its PH on adding small amount of strong acid or strong base. This buffer has reserve acidity and reserve allcalinits. PH agan aidie buffer PH = pka + log [ salt for best buffer acters, pH=Pkati - when [salt] or [Consugats] = facil] then, [PM = PKg) PH af a basce buffer :- Pon=pky + log [salt) [base] For best buffer, Pok=PIGEI EPH=14-pon . Accurate description af buffer solutions are: 1. y a solution is buffer, its PH is nearly neutral 111. Additions af strong and to a buffer shifts the equilibrims - such that it is consumed iv. Y a strong bese is added to a buffer, it reacts with and comforint of the mixten. : Answer: Te. 1, 11 & 10