For preparing a buffer solution of pH = 7.0, which buffer system will you choose?

Question

For preparing a buffer solution of pH = 7.0, which buffer system will you choose? (A)  H3PO4,H2PO4-  (B)  H2PO4-,PO43-  (C)  HPO42-,PO43-  (D)  H3PO4, PO43-

Tardigrade Admin · Accepted Answer

H 2 PO 4-+ H 2 OHPO 42-+ underset textacidH 3 O + H 2 PO 4-+ H 2 OH 3 PO 4+ underset text base OH - Similarly, HPO 42-+ H 2 OPO 43-+ underset text acid H + HPO 42-+ H 2 OH 2 PO 4-+ underset text base OH - ∴ H 2 PO 4- and HPO 42- are amphiprotic anions which can undergo ionisation to form H+ions and can undergo hydrolysis to form O H-ions. Thus, for preparing a buffer solution of p H=7.0, the buffer system of weak acid H 2 PO 4- and its conjugated base H O 42- are used.

Q. For preparing a buffer solution of $p H = 7.0$ , which buffer system will you choose?

$H_{3} P O_{4}, H_{2} P O_{4}^{-}$

$H_{2} P O_{4}^{-}, P O_{4}^{3 -}$

$H P O_{4}^{2 -}, P O_{4}^{3 -}$

$H_{3} P O_{4}, P O_{4}^{3 -}$

Q. For preparing a buffer solution of pH=7.0, which buffer system will you choose?

H3​PO4​,H2​PO4−​

H2​PO4−​,PO43−​

HPO42−​,PO43−​

H3​PO4​,PO43−​

Q. For preparing a buffer solution of $p H = 7.0$ , which buffer system will you choose?

$H_{3} P O_{4}, H_{2} P O_{4}^{-}$

$H_{2} P O_{4}^{-}, P O_{4}^{3 -}$

$H P O_{4}^{2 -}, P O_{4}^{3 -}$

$H_{3} P O_{4}, P O_{4}^{3 -}$