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Moderate

Finding a Conjugate Acid

APCHEM-WRKR7G

Which of the following is the conjugate acid of $HP{ { O }_{ 4 } }^{ -2 }$ ?

A

${ H }_{ 2 }P{ { O }_{ 4 } }^{ - }$

B

$P{ { O }_{ 4 } }^{ -3 }$

C

${ H }_{ 3 }P{ { O }_{ 4 } }$

D

${ H }_{ 3 }O^{ + }$