nganhado05 nganhado05
  • 29-02-2024
  • Chemistry
contestada

100,0 ml mẫu nước uống được xử lý bằng dung dịch đệm amoni để đưa pH về 10. Sau đó chuẩn độ bằng dung dịch EDTA 5,14.10-3 M với chỉ thị ET00 hết 21,46 ml thì đạt điểm cuối. Tính độ cứng tổng cộng của nước theo đơn vị mg CaCO3/l

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