Question

Which tement regarding buffer solution is correct? sobation is cemposod of a misture of a weak acid and a weak hase capacity is a quantitative mcasure of the resistance to pll change of a b sltin c) butler solution has targest cagacity when the mole sumber of weak acid is langer dhen that of ) buffect solution has largest capacity when the acid concentetion is smaller than the 5) In a typical electrochemical cell, which of the following statemes is wrong? external wire, clectrons travel by Sale beidge isolates the reactsens but mainins clectrsical conat betwm the two halfels c) A salle bridge is useld o er fahe? 6 peint 5) as that used to esche the amount of

Answer 1

7 a A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. so this option is incorrect

b. This is correct

From among c and d, d is correct, it is a direct consequence of the Hendersen-Hasselbach Equation.

8 The option d is wrong here. In a salt the cations move to the cathode to compensate for the loss of the cations during functioning of the electrochemicl cell. Similarly, anions move to the anode region.

9 a and d. "d" is the exact answer. "a" is the result of "d".

The equivalence point is the ideal point for the completion of titration. In order to obtain accurate results the equivalence point must be attained precisely and accurately. The solution of known concentration, or titrant, must be added to the solution of unknown concentration, or analyte, very slowly in order to obtain a good result. At the equivalence point the correct amount of standard solution must be added to fully react with the unknown concentration.

The end point of a titration indicates once the equivalence point has been reached. It is indicated by some form of indicator which varies depending on what type of titration being done.

9. b will show a higher quantum yield since it is structure is more rigid out of the two molecules