氫氧化鉀大家都知道，作為一種化工產(chǎn)品，很多實(shí)驗(yàn)中都能夠用的著，其實(shí)成品當(dāng)中并不全是它，也會(huì)摻雜一下其它的雜質(zhì)。一般我們會(huì)根據(jù)不同的需要來選擇不同含量的產(chǎn)品，那么這個(gè)時(shí)候就需要我們來測(cè)試這其中的含量了。所以，接下來我們就來了解一下其測(cè)試的方法。
As we all know, potassium hydroxide, as a chemical product, can be used in many experiments. In fact, not all of the finished products are made of it, but also doped with other impurities. Generally, we will choose products with different content according to different needs, so we need to test the content at this time. So, let's take a look at how to test it.
1、在測(cè)定氫氧化鉀之前需要先配制好0.1mol/L的鹽酸標(biāo)準(zhǔn)滴定溶液。
1. A 0.1mol/l hydrochloric acid standard titration solution needs to be prepared before the determination of potassium hydroxide.
基準(zhǔn)物：需要使用無水碳酸鈉；
Reference material: anhydrous sodium carbonate is required;
指示劑：需要使用甲基紅-溴甲酚綠；
Indicator: methyl red bromocresol green is required;
終點(diǎn)顏色：等到甲基紅-溴甲酚綠從綠色變?yōu)榘导t色即可；
End color: wait until methyl red bromocresol green changes from green to dark red;
計(jì)算公式：c（HCl）=2m（碳酸鈉）/M（碳酸鈉）*V（HCl）。
Calculation formula: C (HCl) = 2m (sodium carbonate) / M (sodium carbonate) × V (HCl).
2、滴定
2. Titration
使用的稱量工具稱出0.15g等待檢測(cè)的氫氧化鉀樣品放置在錐形瓶里面，需要加水將其溶解，然后滴入1～2滴甲基橙指示劑，在使用鹽酸標(biāo)準(zhǔn)溶液滴定溶液從黃色變?yōu)槌壬涂赏Ｖ沽恕?/div>
Use a professional weighing tool to weigh 0.15g of potassium hydroxide sample to be tested and place it in a conical flask. First, add water to dissolve it, then drop 1-2 drops of methyl orange indicator, and then titrate it with hydrochloric acid standard solution until the solution changes from yellow to orange.
計(jì)算公式：w%=[c（HCl）*V（HCl）*M（樣品）/m（樣品）]*100%；
Calculation formula: W% = [C (HCl) × V (HCl) × m (sample) / M (sample)] * 100%;
c:代表鹽酸標(biāo)液的濃度含量；
c: Represents the concentration content of hydrochloric acid standard solution;
V：表示所用鹽酸標(biāo)液的體積大??；
5: Indicates the volume of hydrochloric acid standard solution used;
M：代表需要測(cè)試產(chǎn)品的摩爾質(zhì)量；
M: Represents the molar mass of the product to be tested;
m：表示稱取的樣品的質(zhì)量，在本次實(shí)驗(yàn)當(dāng)中的數(shù)值為0.15。
m: Represents the mass of the weighed sample, the value in this experiment is 0.15.
以上介紹的就是在實(shí)驗(yàn)室當(dāng)中我們測(cè)定氫氧化鉀含量的方法，由于在使用的時(shí)候?qū)Ξa(chǎn)品的含量要求是需要準(zhǔn)確數(shù)據(jù)的，所以這就要求試驗(yàn)過程中我們需要注意操作正確，同時(shí)還要避免出現(xiàn)危險(xiǎn)事故，畢竟其也是屬于強(qiáng)堿性質(zhì)的，不要直接用手或皮膚接觸。
The above is the method for determining the content of potassium hydroxide in the laboratory. Since the content of the product requires accurate data when it is used, we need to pay attention to the correct operation during the test process, and avoid dangerous accidents. After all, it is also a strong alkali, so do not directly contact with hands or skin.
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