Question

Which of the following sets of chemicals can be used to prepare buffer solutions? For each one that can, identify the weak acid and its conjugate base. Include charge (if any) and phase. Enter "none" for both if a buffer is not possible. A.) Na2HPO4+HCl Is a buffer possible (Yes or No) and what is the weak acid and what is the conjugate base B.)NH4Cl+NH3 Is a buffer possible (Yes or No) and what is the weak acid and conjugate base

C.)Na3PO4+NaOH Is a buffer possible (Yes or No) What is the weak acid and Conjugate base

D.)NH4Cl+NaNO3 Is a buffer possible (yes or no) What is the Weak Acid and Conjugate Base?

Answer 1

ANS.

(A). Na₂HPO₄+HCl

Buffer not possible because both the reagents are acidic in nature.

Na₂HPO₄ is the weak acid.

Conjugate base will be PO₄^3-

(B). NH₄Cl+NH₃

Yes

NH₄⁺ weak acid

NH₃ conjugate base

(C). Na₃PO₄+NaOH

No buffer possible

None

(D) NH4Cl+NaNO3

No buffer possible

NH₄⁺ weak acid

NH₃ CONJUGATE BASE