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Bunting
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I am doing my chemistry practicle and my tecaher has told me that I need to standerise my 0.1moldm-3 solution of NaOH with HCl acid. But I don't know why or how, or what concentration of HCl. Does anyone have any ideas pls?
To standardize NaOH, you will need to perform a titration with a known concentration of acid, such as HCl. First, measure out a specific volume of NaOH solution using a volumetric flask. Then, add a few drops of an indicator, such as phenolphthalein, to the flask. Slowly add the acid solution to the NaOH solution until the indicator changes color. Record the volume of acid used, and use this information to calculate the concentration of the NaOH solution.
The purpose of standardizing NaOH is to determine its exact concentration. This is important because the concentration of NaOH can vary due to factors such as storage conditions and evaporation. Knowing the exact concentration allows for accurate and precise results in experiments and other scientific processes.
The concentration of HCl used to standardize NaOH will depend on the concentration of the NaOH solution. It is recommended to use a concentration of HCl that is close to the expected concentration of the NaOH. For example, if you expect the NaOH to be around 0.1 M, then you can use a 0.1 M HCl solution for standardization.
Yes, you can use any acid with a known concentration to standardize NaOH. However, it is important to choose an acid that will react with NaOH in a 1:1 ratio, such as HCl. This will make calculating the concentration of NaOH easier.
The titration is complete when the indicator changes color. For example, phenolphthalein will change from colorless to pink in the presence of excess base. You should also see a stable color change that lasts for at least 30 seconds. It is important to add the acid solution slowly and swirl the flask to ensure an accurate endpoint.