Quiz — 61f15ac906b1f_corrigé_pH des solutions aqueuses-Série (1).pdf

Question 1 sur 10 20:00

[{"id":29990,"question":"Quel est le pH d'une solution neutre ?","option_a":"0","option_b":"7","option_c":"14","option_d":"Variable selon la température","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une solution neutre a un pH égal à 7, indiquant une concentration égale en ions H₃O⁺ et OH⁻.","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\", \"b\": \"7\", \"c\": \"14\", \"d\": \"Variable selon la température\"}}","_debug_options_count":4},{"id":29991,"question":"Le jus de citron a un pH d'environ 2. Il s'agit donc d'une solution...","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un pH de 2 est inférieur à 7, donc le jus de citron est une solution acide.","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":29992,"question":"Quelle est la formule permettant de calculer le pH d'une solution d'acide fort ?","option_a":"pH = -log[H₃O⁺]","option_b":"pH = log[H₃O⁺]","option_c":"pH = [H₃O⁺]","option_d":"pH = 14 - pOH","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pour un acide fort, le pH se calcule par pH = -log[H₃O⁺], où [H₃O⁺] est la concentration en ions hydronium.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"pH = -log[H₃O⁺]\", \"b\": \"pH = log[H₃O⁺]\", \"c\": \"pH = [H₃","_debug_options_count":4},{"id":29993,"question":"Une solution de soude (NaOH) a un pH de 13. Quel est son caractère ?","option_a":"Acide","option_b":"Basique","option_c":"Neutre","option_d":"Amphotère","option_e":"","option_f":"","bonne_reponse":"b","explication":"Un pH de 13 est supérieur à 7, donc la solution est basique (caractéristique des bases fortes comme NaOH).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Acide\", \"b\": \"Basique\", \"c\": \"Neutre\", \"d\": \"Amphotère\"}}","_debug_options_count":4},{"id":29994,"question":"Le BBT (Bleu de Bromothymol) devient jaune en milieu acide.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le BBT est jaune en milieu acide (pH \u003C 6), bleu en milieu basique (pH \u003E 7,6) et vert en milieu neutre.","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":29995,"question":"Pour une solution de concentration [H₃O⁺] = 10⁻⁴ mol\/L, quel est son pH ?","option_a":"4","option_b":"-4","option_c":"10","option_d":"14","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le pH se calcule par pH = -log(10⁻⁴) = 4. C'est une solution acide.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"4\", \"b\": \"-4\", \"c\": \"10\", \"d\": \"14\"}}","_debug_options_count":4},{"id":29996,"question":"Parmi ces indicateurs, lequel est adapté pour un pH de 9 ?","option_a":"Phénolphtaléine","option_b":"BBT","option_c":"Hélianthine","option_d":"Indigo carmin","option_e":"","option_f":"","bonne_reponse":"a","explication":"La phénolphtaléine vire au rose pour un pH entre 8,2 et 10, ce qui correspond à un milieu basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Phénolphtaléine\", \"b\": \"BBT\", \"c\": \"Hélianthine\", \"d\": \"Indigo","_debug_options_count":4},{"id":29997,"question":"Le pH d'une solution peut-il être négatif ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, pour des solutions très concentrées en ions H₃O⁺, le pH peut être négatif (ex : pH = -1 pour [H₃O⁺] = 10 mol\/L).","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":29998,"question":"Quelle est la relation entre pH et pOH pour une solution aqueuse à 25°C ?","option_a":"pH + pOH = 14","option_b":"pH - pOH = 7","option_c":"pH × pOH = 1","option_d":"pH = pOH","option_e":"","option_f":"","bonne_reponse":"a","explication":"À 25°C, la relation est pH + pOH = 14, car le produit ionique de l'eau Kw = 10⁻¹⁴.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"pH + pOH = 14\", \"b\": \"pH - pOH = 7\", \"c\": \"pH × pOH = 1\", \"d\": \"","_debug_options_count":4},{"id":29999,"question":"Une solution a un pH de 5. Si on la dilue 100 fois, son nouveau pH sera...","option_a":"7","option_b":"3","option_c":"6","option_d":"4","option_e":"","option_f":"","bonne_reponse":"c","explication":"En diluant une solution acide, le pH augmente. Pour une dilution au 1\/100, le pH passe de 5 à 6 (car [H₃O⁺] divisée par 100).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"7\", \"b\": \"3\", \"c\": \"6\", \"d\": \"4\"}}","_debug_options_count":4}]