Question: Which choice is most suitable to make a buffer with a pH of 9.0? Thank you in advance! Which conjugate pair is suited best to

Which choice is most suitable to make a buffer with a pH of 9.0? Thank you in advance!
Which conjugate pair is suited best to make this buffer? Phosphoric acid H3PO4 and dihydrogen phosphate ion H2PO4 Carbonic acid H2CO3 and bicarbonate ion HCO3 Monohydrogen phosphate ion HPO42 and phosphate ion PO43 Bicarbonate ion HCO3and carbonate ion CO32 Ammonium ion +NH4 and ammonia NH3 Lactic acid CH3CH(OH)COOH and lactate ion CH3CH(OH)COO Acetic acid CH3COOH and acetate ion CH3COO Phenol C6H5OH and phenolate ion C6H5O Formic acid HCOOH and formate ion HCOO Dihydrogen phosphate ion H2PO4and monohydrogen phosphate ion HPO42
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