北京课改版化学九下11.1对酸碱的初步认识复习ppt课件.pptx

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1、对酸碱的初步认识1知识网络知识网络酸与碱的组成溶液的酸碱度（pH）及其与生命活动、工业生产的关系酸与碱的识别无色酚酞溶液紫色石蕊溶液酸：氢离子+酸根离子碱：氢氧根离子+金属离子对酸碱的初步认识2知识回顾知识回顾知识点1酸碱指示剂[注意]①指示剂遇到酸性溶液或碱性溶液时，变色的是指示剂，而不是酸性溶液或碱性溶液。②根据指示剂颜色的变化，能判断溶液的酸碱性，但不能确定此溶液一定是酸或一定是碱。因为有的盐溶液可能会显酸性或碱性，如Na2CO3溶液显碱性。酸碱指示剂酸性碱性紫色石蕊试液___色___色无色酚酞___色

2、___色红蓝无红3知识点2酸与碱的组成酸是由和组成的。碱是由和组成的。知识点3溶液pH的概念及测定方法溶液的酸碱度可用pH表示，pH与溶液酸碱性的关系如图所示：知识回顾氢酸根金属元素氢氧根4pH＜7：溶液显____性，pH越___，酸性越强；pH＝7：溶液显___性；pH＞7：溶液显___性，pH越___，碱性越强。pH测定方法：在______上放一小片pH试纸，用_______蘸取被测液，滴到试纸上，把试纸的颜色与__________比较。知识回顾酸小中碱大玻璃片玻璃棒标准比色卡5知识点4溶液酸碱度的重要意

3、义1．化工生产中许多反应必须控制在一定pH范围内。2．农作物适宜在pH为___或接近__的土壤中生长。3．测定雨水的pH(酸雨的pH小于____)，可以了解空气的污染情况。4．测定人体内或排泄出的体液的pH，可以了解人体的健康状况。知识回顾775.6shop.99114.com/50673281shop.99114.com/50673437shop.99114.com/50673209shop.99114.com/50669256shop.99114.com/51399270shop.99114.com/51

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