Góp ý
- Đúng là khi đo pH của nước hay một dung dịch nào đó, người ta thường dùng phương pháp so màu ( sự đổi màu của giấy quỳ ); nhưng phương pháp này thường không chính xác, chúng ta chỉ có thể nhận biết được dung dịch cần xác định là kiềm, axit, hay trung tính. Hiện nay, người ta thường dùng thiết bị đo pH dạng cầm tay hoặc để bàn thì có thể xác định được con số chính xác.
- Riêng về đất, chưa thấy ai đo pH của đất như cách trên. Cũng có máy đo pH của đất. Các bạn nào quan tâm thì liên hệ với mình:
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