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  • 什么是基准物质？ - 知乎
    基准物质(praimary standard)是分析化学中用于直接配制标准溶液或标定滴定分析中操作溶液浓度的物质。 基准物质的定义越来越准确，分类明确，在许多领域有着重要的作用。中文名 基准物质 外文名 primary standard 用途 配制或者标定标准溶液 作用 保证测量
  • Why NaOH is not a primary standard. - Toppr
    a primary standard is insoluble solid compound that is very clear, with a consistent formula that does not change on exposure to the atmosphere and has a relatively high molar mass in order to be suitable for use as a primary standard:
  • Which of the following are primary standard? - Toppr
    A primary standard is a reagent that is extremely pure, stable, has no water of hydration and has a high molecular weight Some primary standards are sodium carbonate, potassium hydrogen iodate, potassium dichromate, oxalic acid etc
  • 对照药品 参比制剂 标准品 对照品 参考品的英文都是啥？ - 知乎
    知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容，聚集了中文互联网科技、商业、影视
  • Which of the following reagents are used as primary standard?
    Primary Standard: A primary standard is a reagent which is very pure, representative of the number of moles the substance contains and easily weighed
  • 知乎盐选 | 6. 1 BIOS 设置
    在 IDE Primary Master 界面中，第一项为「IDE HDD Auto-Detection」，它的功能是用来自动检测 IDE 硬盘的，选中该项后，按「Enter」键，系统就会自动检测当前的硬盘，并将其检测到的硬盘参数显示在屏幕上，其中包含有硬盘的存取模式、硬盘的容量、柱面数、读写磁头数、写预补偿以及磁头通停放区和扇区
  • Which one of the following is not a primary standard? - Toppr
    Why is NaOH not a primary standard? View Solution Q4 For standardizing N a O H solution,
  • Explain:Why is K_2Cr_2O_7 generally preferred to Na_2Cr_2O_7 in . . . - Toppr
    Standard XII Chemistry N a 2 C r 2 O 7 is not a primary standard in volumetric analysis Reason : N
  • For standardising NaOH solution, which of the following is used . . . - Toppr
    Oxalic acid dihydrate, H 2 C 2 O 4 ⋅ 2 H 2 O (s) is often used as a primary reagent to standardise sodium hydroxide solution Which of these facts are reasons to choose this substance as a primary standard? I It is diprotic II It is a stable compound that can be weighed directly in air III It is available in pure form
  • Which one of the following is a primary standard? - Toppr
    The primary standard is a compound of sufficient purity from which standard solutions of known normalities can be prepared by direct weighing of it and diluting to a defined volume of solution Potassium Dichromate ( K 2 C r 2 O 7 ) is suitable to be used as a primary standard





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