Quiz — 63c95bbd7794d_corrigé_SC_Equilibre acide_base_Série_1.pdf

Question 1 sur 10 20:00

[{"id":8715,"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":"10","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le pH se calcule avec la formule 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\": \"10\"}}","_debug_options_count":4},{"id":8716,"question":"Un acide fort a une constante d'acidité (Ka) très grande.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un acide fort se dissocie complètement dans l'eau, donc sa constante d'acidité (Ka) est très grande.","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":8717,"question":"Quel est le pKa d'un acide si Ka = 10^-5 ?","option_a":"5","option_b":"-5","option_c":"10^-5","option_d":"0,00001","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le pKa se calcule avec la formule pKa = -log(Ka). Ici, pKa = -log(10^-5) = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"5\", \"b\": \"-5\", \"c\": \"10^-5\", \"d\": \"0,00001\"}}","_debug_options_count":4},{"id":8718,"question":"Une solution tampon est une solution qui :","option_a":"Change radicalement de pH lorsqu'on ajoute un acide","option_b":"Résiste aux variations de pH","option_c":"Augmente toujours le pH","option_d":"Ne contient que des bases","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une solution tampon résiste aux variations de pH lorsqu'on ajoute une petite quantité d'acide ou de base.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Change radicalement de pH lorsqu'on ajoute un acide\", \"b\": \"Rési","_debug_options_count":4},{"id":8719,"question":"La constante de basicité (Kb) d'une base faible est toujours inférieure à 1.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une base faible ne se dissocie pas complètement, donc sa constante de basicité (Kb) est toujours inférieure à 1.","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":8720,"question":"Quel est le pH d'une solution de HCl à 0,01 mol\/L ?","option_a":"1","option_b":"2","option_c":"3","option_d":"12","option_e":"","option_f":"","bonne_reponse":"b","explication":"HCl est un acide fort qui se dissocie complètement. [H3O+] = 0,01 mol\/L, donc pH = -log(0,01) = 2.","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\": \"2\", \"c\": \"3\", \"d\": \"12\"}}","_debug_options_count":4},{"id":8721,"question":"Une solution a un pH de 8. Que peut-on dire de cette solution ?","option_a":"C'est une solution acide","option_b":"C'est une solution basique","option_c":"C'est une solution neutre","option_d":"C'est une solution tampon","option_e":"","option_f":"","bonne_reponse":"b","explication":"Un pH de 8 est supérieur à 7, donc la solution est 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\": \"C'est une solution acide\", \"b\": \"C'est une solution basique\", \"c\"","_debug_options_count":4},{"id":8722,"question":"La réaction entre un acide et une base produit toujours de l'eau.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La réaction entre un acide et une base produit de l'eau uniquement si l'acide et la base sont forts. Sinon, elle produit un sel et de l'eau.","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":8723,"question":"Quel est l'effet d'ajouter une petite quantité d'acide à une solution tampon ?","option_a":"Le pH augmente fortement","option_b":"Le pH diminue fortement","option_c":"Le pH reste presque inchangé","option_d":"La solution devient acide","option_e":"","option_f":"","bonne_reponse":"c","explication":"Une solution tampon résiste aux variations de pH, donc le pH reste presque inchangé.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Le pH augmente fortement\", \"b\": \"Le pH diminue fortement\", \"c\": \"","_debug_options_count":4},{"id":8724,"question":"Quelle est la formule de la constante d'acidité (Ka) ?","option_a":"Ka = [H3O+][A-]\/[HA]","option_b":"Ka = [HA]\/[H3O+][A-]","option_c":"Ka = [H3O+]\/[HA]","option_d":"Ka = [A-]\/[HA]","option_e":"","option_f":"","bonne_reponse":"a","explication":"La constante d'acidité (Ka) se calcule avec la formule Ka = [H3O+][A-]\/[HA], où HA est l'acide et A- sa base conjuguée.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Ka = [H3O+][A-]\/[HA]\", \"b\": \"Ka = [HA]\/[H3O+][A-]\", \"c\": \"Ka = [H","_debug_options_count":4}]