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固体溶解度定义标准:溶剂量为100g.判断溶液酸碱性的标准:PH.即PH<7为酸性,PH=7为中性,PH>7为碱性.实验中药品取量标准:一般按最少量,即液体1~2ml,固体只需盖满试管底部.给试管里的液体加热时液体量的标准:不超过试管容积的23.不同种类元素的判断标准:核电荷数不同.金属与酸溶液能否反应的判断标准:金属是否排在金属活动性顺序表中H的前面.复分解反应能否发生的判断标准:生成物中是否有沉淀、气体
Solid solubility is defined as the standard: the amount of solvent is 100g. Criteria to determine the pH of the solution: PH. PH <7 is acidic, PH = 7 is neutral, PH> 7 is alkaline. The minimum amount, that is, liquid 1 ~ 2ml, the solid just covered the bottom of the test tube to liquid in the test tube when the amount of liquid heating standard: not more than the test tube volume 23. Different types of elements of the criteria: different nuclear charge metal and Acid solution can judge whether the reaction: the metal is ranked in the metal activity sequence table in front of H. Metathesis reaction to determine whether the criteria: whether there is precipitation in the product, the gas