{"id": "card_pchem_acid_base", "kind": "reference", "title": "Acid-base — pKa + pKb = 14", "body": "For an acid and its conjugate base, pKa + pKb = pKw = 14 at 25 C (sealed). This is Ka * Kb = Kw, the autoionization of water, in logarithms - the backbone of pH, buffers and titrations. Rests on chemistry (pH is sealed on the chemistry stick).", "source": {"label": "Narrow Highway — physical chemistry", "url": "", "authority_tier": "engine_derived"}, "shelf": "codex", "box": "physical_chemistry", "bands": ["physical chemistry", "pillar", "acid_base", "one map"], "subject": "Acid-base — pKa + pKb = 14", "connections": [{"to_card_id": "card_floor_physical_chemistry", "relationship": "part_of", "evidence": "a branch of physical chemistry (Acid-base)"}, {"to_card_id": "card_floor_chemistry", "relationship": "connects_at", "evidence": "pH and the conjugate pair - the acid-base chemistry on the chemistry floor"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.physical.chemistry", "facets": {"subject": ["acid_base", "one map", "physical chemistry", "pillar"]}, "presentation": {"glyph": "•", "kind_label": "physical chemistry", "by": "Narrow Highway — physical chemistry", "authority": "engine_derived", "posted": "", "standing": ""}, "neighbors": [{"id": "card_floor_physical_chemistry", "title": "Physical chemistry — rate, equilibrium, acid-base, redox", "relationship": "part of", "why": "a branch of physical chemistry (Acid-base)", "href": "/card/card_floor_physical_chemistry", "resolved": true}, {"id": "card_floor_chemistry", "title": "Chemistry — quantum mechanics applied, the periodic table", "relationship": "connects at", "why": "pH and the conjugate pair - the acid-base chemistry on the chemistry floor", "href": "/card/card_floor_chemistry", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_pchem_acid_base", "next_step": {"do": "follow a connection: what this card rests on, and what rests on it", "door": "FIND", "tool": "card_connections", "params": {"id": "card_pchem_acid_base"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}