I Wished To Go Back To My Country

696 words - 3 pages

1.Chuẩn axit mạnh bằng bazơ mạnh1.1. Đường chuẩn độXét phép chuẩn độ Voml bazơ mạnh XOH nồng độ Comol/l bằng dung dịch axít mạnh HY C mol/l. Thể tích Axit HY đã dùng khi chuẩn độ la VmlPhương trình phản ứng chuẩn độ:XOH + HY = XY + H2OTại điểm tương đương [H+] = [OH-], pH=7Tại bất kì thời điểm nào của quá trình chuẩn độ ta đều có thể áp dụng phương trình định luật bảo toàn proton( ở đây trùng với phương trình bảo toàn điện tích) cho hệ chuẩn độ:[H+] - [OH-] + [X+] - [Y-] = 0 (1.1)[H+]=h ; [OH-]=Kw/h ; [X+]= CXOH ;[Y-]=CHYThay vào (1.1) ta có phương trình tổng quát của đường chuẩn độ axit mạnh bằng bazơ mạnh:H (1.2)Từ (1.2) ta có thể rút ra:(1.3)Nhân (1.3) với tỉ số ta rút ra tỉ số mol cũng là tỉ số đương lượng P ( bởi vì nồng độ của chất phản ứng bằng nồng độ đương lượng)(1.4)Cần kẽ bảng 6.2 tui ko biết làm ?\Từ kết quả tính và xây dựng đường chuẩn độ có thể rút ra một số nhận xét sau:-Sự biến thiên đột ngột pH tương ứng với sự biến thiên một lượng không đáng kể chất chuẩn (trong phạm vi sai số cho phép) ở gần điểm tương đương tạo thành bước nhảy chuẩn độ.- Để chuẩn độ chính xác phải chọn chất chỉ thị thỏa mãn 2 yêu cầu:+Có chỉ số chuẩn độ trung bình hoặc rất gần với pH tại điểm tương đương của phép chuẩn độ ( pT+pHtđ)+Phải đổi màu đột ngột tại điểm kết thúc chuẩn độ. Tuy nhiên các điều kiện này không dễ thực hiện...

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