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·实验预习·１．ｐＨ──酸碱度的表示法及测定ｐＨ的简易方法．２．怎样正确使用ｐＨ试纸？３．溶解试样时，为什么要用蒸馏水而不用自来水？４．在测定水样、土壤酸碱性时，为什么不用石蕊和酚酞而用ｐＨ试纸？ ·实验报告·实验目的实验用品仪器：药品和材料：实验记录和分
·Experimental preparations 1. pH - the representation of pH and the easy way to determine pH. 2. How to use pH test paper correctly? 3. Why use distilled water instead of tap water when dissolving the sample? 4. Why do I not use litmus and phenolphthalein instead of pH test paper when measuring water and soil acidity? ·Experimental Reports ·Experimental Purposes Laboratory Supplies: Drugs and Materials:Experimental records and scores