Question

Biochemistry.

please answer both questions

10 Titration 1 point Based on this titration, what is the pH of the solution at its pka? Titration Type your answer... 11 1 point Identify the spot below where the amount of acid is equal to the amount of base. pH Titration 10 15 20 Volume of titrant (ml) 25 30 pH 5 25 30 10 15 20 Volume of titrant (ml)

Answer 1

10)Pka is the at the middle point of the buffer plateform(1st plateform) and the pH value at that point in the graph is 8. So, we can say pH at Pka is half/double of equivalance point depending on titrant is base/acid respectively.

11) At the point where amount of acid is equal to amount of base in the solution , is called equivalence point.

So, from the graph u'll see at pH 4 the equivalence point is reached because before this point when you added Acid to the base in the solution it was lesser than the base, but after end of buffer zone (1st plateform on the graph) , the pH starts decreasing at drastic rate , meaning middle point of slope is the point of equivalance.