Testez vos connaissances sur le pH des solutions aqueuses !

Question 1 sur 10 10:00

[{"id":68832,"question":"Quel est le pH d'une solution neutre ?","option_a":"0","option_b":"7","option_c":"14","option_d":"10","option_e":"","option_f":"","bonne_reponse":"B","explication":"Une solution neutre a un pH de 7, comme l'eau pure à 25°C.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68833,"question":"Un pH de 3 correspond à une solution...","option_a":"très basique","option_b":"neutre","option_c":"acide","option_d":"peu acide","option_e":"","option_f":"","bonne_reponse":"C","explication":"Un pH inférieur à 7 indique une solution acide.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68834,"question":"L'indicateur coloré phénolphtaléine devient rose en milieu...","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"La phénolphtaléine devient rose en milieu basique (pH \u003E 8).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68835,"question":"Quelle est la formule du pH ?","option_a":"pH = -log[H3O+]","option_b":"pH = log[H3O+]","option_c":"pH = [H3O+]","option_d":"pH = 1\/[H3O+]","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le pH est défini par pH = -log[H3O+], où [H3O+] est la concentration en ions oxonium.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68836,"question":"Une solution de pH 9 est...","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Un pH de 9 indique une solution basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68837,"question":"Quel ion est responsable de l'acidité d'une solution ?","option_a":"OH-","option_b":"H3O+","option_c":"Cl-","option_d":"Na+","option_e":"","option_f":"","bonne_reponse":"B","explication":"L'ion oxonium (H3O+) est responsable de l'acidité d'une solution.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68838,"question":"Le papier pH change de couleur en fonction de...","option_a":"la température","option_b":"la pression","option_c":"l'acidité ou la basicité","option_d":"la couleur de la solution","option_e":"","option_f":"","bonne_reponse":"C","explication":"Le papier pH change de couleur en fonction du pH, donc de l'acidité ou de la basicité de la solution.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68839,"question":"Une solution de pH 2 est 100 fois plus acide qu'une solution de pH 4.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Chaque unité de pH correspond à un facteur 10 en concentration en ions H3O+. Une solution de pH 2 est donc 100 fois plus acide qu'une solution de pH 4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68840,"question":"Quelle est la concentration en ions H3O+ d'une solution de pH 3 ?","option_a":"10^-3 mol\/L","option_b":"10^-7 mol\/L","option_c":"10^-11 mol\/L","option_d":"10^3 mol\/L","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le pH = -log[H3O+], donc [H3O+] = 10^-pH = 10^-3 mol\/L.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":68841,"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, le pH peut être négatif pour des solutions très concentrées en ions H3O+ (pH \u003C 0).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]