ارجو المساعدة في تمرين من تمارين الباكالوريا البيضاء
 

حض الاسكوربيك (الاسبيرين) نرمز له AH نعتبره ينحل جزئيا في الماء . باستعمال قرص اسبيرين "500" نحضر500mlمن محلول الحمض السابق وناخد منهVa=100mlونعايره بواسطة محلول لهيدروكسيد الصوديوم ذي التركيز المولي Ca=1.02*0.1 mol/lفنحصل على المنحنيين:pH=f(Vb) )dph/dt=f(t
1-ا- احسب كتلة الحمض في القرص الواحد مقدرة بالميللي غرام (mg)

رد: ارجو المساعدة في تمرين من تمارين الباكالوريا البيضاء
 

رد: ارجو المساعدة في تمرين من تمارين الباكالوريا البيضاء
 

oui...je sais mais ana nbhat 3ala tarika

رد: ارجو المساعدة في تمرين من تمارين الباكالوريا البيضاء
 

أعتقد أن:
من خلال المنحنىpH=f(Vb) يمكن إيجاد Vb eq

ونعلم أن: Ca * Va = Cb * Vb eq

ومنه لدينا من معطيات التمرين Cb و Va وأننا وجدنا من البيان قيمة Vb eq
أي أننا نستطيع إيجاد تركيز Ca

ونعلم أن n= Ca * Vt
حيث أن Vt هو حجم الوسط الكلي قبل المعايرة أي : Vt= 500ml

ومنه نستطيع إيجاد كمية المادة n

ونعلم أن: m = n*M

من خلال صيغة حمض الاسكوربيك نستطيع إيجاد قيمة M ولدينا سابقا قيمة n

وبالتالي استطعنا إيجاد كتلة حمض الاسكوربيك بالغرام ثم نحولها إلى الميليغرام

إذا يوجد خطأ في طريقة الحل أرجو تنبيهي لها

رد: ارجو المساعدة في تمرين من تمارين الباكالوريا البيضاء
 

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