Quiz — Exercice - R-action acide-base.pdf

Question 1 sur 10 20:00

[{"id":36230,"question":"Quel est le pH d'une solution dont la concentration en ions H₃O⁺ est de 10⁻³ mol\/L ?","option_a":"1","option_b":"3","option_c":"7","option_d":"11","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le pH se calcule par pH = -log[H₃O⁺]. Ici, pH = -log(10⁻³) = 3.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"1\", \"b\": \"3\", \"c\": \"7\", \"d\": \"11\"}}","_debug_options_count":4},{"id":36231,"question":"Une solution a un pH de 9. Est-elle acide, basique ou neutre ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Un pH supérieur à 7 indique une solution basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":36232,"question":"Quel ion est produit lors de la dissociation d'un acide dans l'eau ?","option_a":"OH⁻","option_b":"H₃O⁺","option_c":"Cl⁻","option_d":"Na⁺","option_e":"","option_f":"","bonne_reponse":"b","explication":"Un acide libère des ions H₃O⁺ (ou H⁺) en solution aqueuse.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"OH⁻\", \"b\": \"H₃O⁺\", \"c\": \"Cl⁻\", \"d\": \"Na⁺\"}}","_debug_options_count":4},{"id":36233,"question":"La réaction entre HCl et NaOH est une réaction de neutralisation. Quel est le produit principal formé ?","option_a":"H₂O et NaCl","option_b":"H₂ et O₂","option_c":"Na₂O et HCl","option_d":"NaOH et HCl","option_e":"","option_f":"","bonne_reponse":"a","explication":"La neutralisation produit de l'eau et un sel : HCl + NaOH → H₂O + NaCl.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"H₂O et NaCl\", \"b\": \"H₂ et O₂\", \"c\": \"Na₂O et HCl\", \"d\": \"","_debug_options_count":4},{"id":36234,"question":"Le bleu de bromothymol est un indicateur coloré qui vire du jaune au bleu entre pH 6,0 et 7,6. Peut-il être utilisé pour un titrage dont le point d'équivalence est à pH 8 ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le point d'équivalence à pH 8 dépasse la zone de virage de l'indicateur (6,0-7,6).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":36235,"question":"Quelle est la formule de l'ion hydroxyde ?","option_a":"H₃O⁺","option_b":"OH⁻","option_c":"H⁺","option_d":"Cl⁻","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'ion hydroxyde, symbole OH⁻, est libéré par les bases en solution aqueuse.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"H₃O⁺\", \"b\": \"OH⁻\", \"c\": \"H⁺\", \"d\": \"Cl⁻\"}}","_debug_options_count":4},{"id":36236,"question":"Lors d'un titrage acido-basique, le volume de solution titrante versé à l'équivalence est de 15 mL. Si la concentration de la solution titrante est de 0,1 mol\/L, quelle est la quantité de matière d'acide titré ?","option_a":"0,001 mol","option_b":"0,015 mol","option_c":"0,15 mol","option_d":"1,5 mol","option_e":"","option_f":"","bonne_reponse":"b","explication":"n = C × V = 0,1 mol\/L × 0,015 L = 0,0015 mol ≈ 0,015 mol (arrondi).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"0,001 mol\", \"b\": \"0,015 mol\", \"c\": \"0,15 mol\", \"d\": \"1,5 mol\"}}","_debug_options_count":4},{"id":36237,"question":"Un indicateur coloré est une substance qui change de couleur en fonction du pH de la solution.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un indicateur coloré change de couleur en fonction du pH, mais il ne modifie pas le pH de la solution.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":36238,"question":"Quel est le pH d'une solution de soude (NaOH) à 0,01 mol\/L ?","option_a":"2","option_b":"7","option_c":"12","option_d":"14","option_e":"","option_f":"","bonne_reponse":"c","explication":"NaOH est une base forte : [OH⁻] = 0,01 mol\/L → pOH = 2 → pH = 14 - 2 = 12.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"2\", \"b\": \"7\", \"c\": \"12\", \"d\": \"14\"}}","_debug_options_count":4},{"id":36239,"question":"La phénolphtaléine est incolore en milieu acide et rose en milieu basique. Peut-elle être utilisée pour un titrage dont le point d'équivalence est à pH 5 ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La phénolphtaléine vire au rose pour un pH \u003E 8,2. À pH 5, elle reste incolore.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4}]