Question: compound formed in solution from the negative ion of an acid and the positive ion of a base
[{'answer': 'bicarbonate', 'provenance': [{'wikipedia_id': '3982', 'title': 'Bicarbonate', 'start_paragraph_id': 1, 'start_character': 24, 'end_paragraph_id': 1, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3982', 'title': 'Bicarbonate', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 338, 'bleu_score': 0.9603762111511761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7672224544888350812}, 'section': 'Section::::Chemical properties.\n'}]}]