Which of the following is not a conjugate acid-base pair?

Question

Which of the following is not a conjugate acid-base pair? (A) HPO 32-, PO 33- (B) H 2 PO 4-, HPO 42- (C) H 2 PO 4-, H 3 PO 4 (D) H 2 PO 4-, PO 33-

Tardigrade Admin · Accepted Answer

Acid 1+ Base 2 leftharpoons Acid 2+ Base 1 HPO 32-+ H 2 O leftharpoons H 3 O ++ PO 33- H 2 PO 4-+ H 2 O leftharpoons H 3 O ++ HPO 42- H 3 PO 4+ H 2 O leftharpoons H 3 O ++ H 2 PO 42-

Q. Which of the following is not a conjugate acid-base pair?

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

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

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

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

Acid $_{1} +$ Base $_{2} ⇌$ Acid $_{2} +$ Base $_{1}$
$H P O_{3}^{2 -} + H_{2} O ⇌ H_{3} O^{+} + P O_{3}^{3 -}$
$H_{2} P O_{4}^{-} + H_{2} O ⇌ H_{3} O^{+} + H P O_{4}^{2 -}$
$H_{3} P O_{4} + H_{2} O ⇌ H_{3} O^{+} + H_{2} P O_{4}^{2 -}$

Q. Which of the following is not a conjugate acid-base pair?

HPO32−​,PO33−​

H2​PO4−​,HPO42−​

H2​PO4−​,H3​PO4​

H2​PO4−​,PO33−​

Acid 1​+ Base 2​⇌ Acid 2​+ Base 1​ HPO32−​+H2​O⇌H3​O++PO33−​ H2​PO4−​+H2​O⇌H3​O++HPO42−​ H3​PO4​+H2​O⇌H3​O++H2​PO42−​

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

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

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

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

Acid $_{1} +$ Base $_{2} ⇌$ Acid $_{2} +$ Base $_{1}$
$H P O_{3}^{2 -} + H_{2} O ⇌ H_{3} O^{+} + P O_{3}^{3 -}$
$H_{2} P O_{4}^{-} + H_{2} O ⇌ H_{3} O^{+} + H P O_{4}^{2 -}$
$H_{3} P O_{4} + H_{2} O ⇌ H_{3} O^{+} + H_{2} P O_{4}^{2 -}$