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Purple litmus, also known as litmus paper, is a useful chemical indicator that is widely used in scientific and laboratory experiments. It is an absorbent paper infused with a natural dye obtained from lichens. Purple litmus is primarily employed to determine the acidity or alkalinity of a solution. Its color changes in response to the pH level present in a substance. In acidic conditions, purple litmus paper turns red, while in alkaline solutions, it retains its original purple color. This characteristic enables scientists and researchers to easily analyze the acidity or basicity of various samples. Due to its simplicity and efficiency, purple litmus paper finds extensive applications in numerous fields including chemistry, biology, and environmental science. Whether it is determining the pH level in chemical reactions or assessing the quality of water or soil, purple litmus plays a fundamental role in providing accurate measurements and aiding in analytical procedures. With its exceptional ability to change color, purple litmus is an invaluable tool, offering valuable insights into the chemical nature of diverse substances.
Purple litmus is a familiar name in chemistry, used to measure pH or apply in other experiments. So what is purple litmus? How to change color? What is the application of purple litmus? Find out with Thptlaihoa.edu.vn in the article below!
What is purple litmus? Advantages of blue litmus compared to other PH indicators
Purple litmus or litmus paper – paper impregnated with an ethanol solution or water and a pigment extracted from the roots of lichens Roccella and Dendrographa. This type of paper was originally purple in color and was used in chemistry experiments and pH measurements. After use, litmus paper will change to another color.
Fast results (usually used in experiments) is the biggest advantage of red litmus. Besides, litmus paper is also used to distinguish gases. Therefore, purple litmus is indispensable in experiments or in laboratories today.
Classification of purple litmus
Purple litmus paper is divided into two main types: red litmus paper and blue litmus paper.
- Red litmus paper : Made by treating plain paper and a dye soaked in a dilute solution of sulfuric acid. Next, they are brought to dry by direct contact with the air.
- Blue litmus paper : When blue litmus paper is dipped in a solution, if the paper turns red, the solution is acidic, and if the paper does not change color, the solution is in equilibrium. Blue litmus is used to identify acids and vinegars.
Moreover, people also divide litmus paper into moist purple litmus and dry purple litmus . To know which type is wet litmus and which is dry, we only need to put one of them in ammonia gas if it is dry purple litmus will not change color, if the litmus paper turns blue, it is moist purple litmus.
How does purple litmus change color?
Blue litmus changes 3 colors depending on whether the solution is acidic, basic or neutral:
- Purple litmus turns red when litmus paper comes in contact with an acidic solution.
- Purple litmus turns blue when litmus paper comes in contact with a basic solution.
- Blue litmus does not change color when the solution is neutral (acidity = basic).
Applications of purple litmus
Purple litmus has many applications in science as well as life such as distinguishing chemicals, measuring pH or testing amniotic fluid, …
Used to distinguish chemical solutions
To identify if a solution is basic or acidic, we only need a small piece of litmus paper that we can easily distinguish or recognize. Speak clearly:
- When purple litmus reacts with acids (eg: HCL, H2SO4, …) the blue litmus will turn red.
- When blue litmus reacts with bases (eg, NaOH, KOH, …), blue litmus turns blue.
- When litmus is in equilibrium or neutral, it will not change color.
Measure pH with red litmus paper
That quick pH measurement is what litmus paper can do. However, purple litmus pH measurement results are only approximate, not 100% accurate. To measure with the most accuracy we need to use a pH meter that will give us high accuracy.
For quick measurement, we use purple litmus as follows: Tear a piece of litmus and dip it in water, then compare it with the accompanying color chart.
- If the pH index is from 1 to 7: the environment is acidic.
- From 7-14: basic environment.
- If litmus paper shows number 7: neutral medium.
In particular, purple litmus can test the amniotic fluid of pregnant women in the last stage. From there, we know whether the fetal status inside the mother’s womb is good or weak to make the most timely solutions.
Where to buy purple litmus?
Where is purple litmus sold or where quality is sold? These are questions many readers are wondering. On the market today, purple litmus is sold everywhere at a cheap price, but the quality is not sure. In particular, for those studying chemistry, buying substandard purple litmus will greatly affect the results.
You should choose reputable places such as pharmacies or scientific research centers to have the best quality and standard litmus paper!
Hope the above article will help you better understand purple litmus. Any questions, please leave a comment below to be answered!
In conclusion, purple litmus is a type of litmus paper that is used in various scientific and laboratory settings. It is made from certain dyes that are extracted from lichens and can indicate the presence of either acidic or basic substances. Purple litmus paper is blue when placed into a neutral or basic solution, but turns red in an acidic environment. This color change is due to the ability of the litmus paper to react with the hydrogen ions present in acids. Additionally, it is important to note that unlike blue litmus, which only indicates the presence of basic substances, purple litmus can provide dual indicators for both acidic and basic solutions.
To change the color of purple litmus, one needs to immerse it in the solution being tested. However, it is crucial to remember that the litmus paper should be completely dry before being tested, as moisture or dampness can cause inaccurate results. Once the paper is inserted into the solution, the color change can be observed almost immediately, allowing for quick and reliable identification of the solution’s acidity or alkalinity.
Purple litmus paper finds numerous applications across various fields. It is extensively used in chemistry laboratories to determine the pH level of substances. Additionally, it has practical applications in the food and beverage industry, where it can be used to test the acidity or alkalinity of different products. Purple litmus paper is also employed in educational settings to help students understand the concept of acidic and basic solutions. Furthermore, it can be helpful in environmental science research, as it allows for the analysis of the acidity or alkalinity of soil and water samples.
Overall, purple litmus plays a significant role in scientific investigations, offering a simple and effective means of identifying acidic and basic substances. Its ease of use, observable color change, and diverse applications make it a valuable tool in various scientific fields.
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