can you help me answer these questions Match the following: 1. Abuffer is most r

Question

can you help me answer these questions

Match the following: 1. Abuffer is most resistant to pH change when... 2. pH pKa2 3. Define the second law of thermodynamics 4, Give the expression for the stability product constant for PbC12 6, equivalence point of a strong acid strong base titration equivalence point of a weak based strong 8 A ligand is a molecule or ion that acts as a What happens at low pH for aluminum hydroxide 10. Half way to equivalence point of a weak acid strong base titration. 11. Define Butter Capacity 12. What is the definition of a good butter system? A. Equivalence point of a weak a strong base titration B, pH 7 C. pH pKa D, the amount of acid equals the amount of base during any ac base titration E. 3/4 of the way to second equivalence point of a diuretic strong base titration. F For any spontaneous process. entropy f the universe increase. IPb2 H. lacidl w [conjugate basel T. Lewis

Explanation / Answer

Question 1.

A buffer is most resistant to pH change when pH = pKa , since pH = pKa + log(A/HA) then A- = HA must be the same, so choose

H

Question 2.

the pH is pKa2, in the SECOND half equivalence point, (not present)

Question 3.

The 2nd law states that :

"F", the entropy must increase always

Question 4.

For Ksp of PbI2

PbI2 <-> Pb+2 + 2I-

Ksp = [PB+2][I-]^2

choose G

Quesiton 5.

if pH > /, then this is basic,

this is true for any equivalence point of WEAK acids

Question 6.

The equivalence point of a strong acid + strong base will have always a pH = 7, since it is neutral

choose B

question 7.

The equivalence point of a weak base + strong acid will always be acidic due to hydrolysis, so choose K

Question 8.

Ligan must act as a:

Lewis bases, since they accept electron pairs

Question 9.

At very loh pH, the Al(OH)3 will dissolve as "I"

Qeustion 11

The buffer capacity is the total amount of acid/base that could be added before the pH does not changes more than 1 units

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