Hello everyone, if you don’t know much about test strips, it doesn’t matter. Today, this site will share with you the knowledge of test strips, including what PH test strips are. After analysis, I hope it can solve everyone’s problems, let’s get started!
Contents of this article
- How to use acid and alkali test paper
- Which test paper is the most accurate
- What’s the matter with the two bars on the test paper >
- What color of test paper is acidic
- The difference between ph test paper and test paper
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- What is pH test paper
1. How to use acid and alkali test paper
1. (2) The test paper should not touch the test tube mouth, bottle mouth, catheter mouth, etc.
2. (3) When measuring the pH of a solution, the test paper cannot be wetted with distilled water in advance, because wetting the test paper is equivalent to diluting the solution being tested, which will resulting in inaccurate measurements.
3. The correct method is to use a glass rod dipped in the solution to be tested and drop it on the middle of the test paper. After the test paper changes color, compare it with the standard color card. to determine the pH of the solution.
4. (4) After taking out the test paper, the container holding the test paper should be tightly closed to avoid contamination by some gases in the laboratory.
2. Which test paper is the most accurate
1. What is the test paper? The accuracy is related to its brand, manufacturing process, and storage conditions.
Whether it is a portable test paper or a laboratory test paper, you need to read the instructions carefully before using it to ensure that the usage conditions meet the requirements.
2. Of course, even if it is the same test paper, different times and different usage methods will affect the accuracy of the results.
Therefore, in order to ensure testingTo ensure the accuracy of the test, it is recommended to follow the operating steps in the instrument manual before testing and conduct the test in a reliable laboratory, hospital or clinic.
3. What’s wrong with the two bars on the test paper
Different Two bars appear on the test paper, which have different meanings. If you are doing a pregnancy test paper test and there are two red lines on the test paper, it means you are pregnant. If you are doing an ovulation test paper test and there are two red lines on the test paper, it means you are about to ovulate. When the ovulation test paper is strong positive, When it turns negative, it\’s usually ovulation.
4. What color of test paper is acidic
1. Spectral pH test paper, different colors correspond to different pH levels. When using it, compare it with the standard test paper color guide to read the corresponding pH value of similar colors.
2. Generally, neutral test paper does not change color. When it is acidic, the test paper will be red. The darker the red, the stronger the acid. When it is alkaline, the test paper will be blue. The more alkaline it will be. The stronger the blue the darker. Therefore, when the test paper turns red, it means that the solution is acidic. The darker the color, the stronger the acidity.
5. The difference between pH test paper and test paper
Test paper is a There is a ready-made test paper for testing the pH of a solution. When using it, tear off a strip and place it in a watch glass. Use a dry glass rod to dip a drop of solution from the glass container. From its color change, you can know the acid and base of the solution. There are three indicators on the pH test paper: methyl red, bromocresol green, and thymol blue. Methyl red, bromocresol green, thymol blue, and phenolphthalein all change color according to certain rules in solutions with different pH values. At present, the general pH analysis test paper contains methyl red [pH 4.2 (red) ~ 6.2 (yellow)], bromocresol green [pH 3.6 (yellow) ~ 5.4 (green)] bromothymol blue [pH 6.7 (yellow) ~ 7.5 (blue)], these mixed acid-base indicators can reflect the variation range of pH 4.5 ~ 9.0 with appropriate amounts.
A pH meter is an electrochemical instrument that measures the pH value of a solution using potentiometric methods. The basis for measurement is: the relationship between the activity of the ion to be measured and its electrode potential obeys the Nernst equation. Combined with a pH composite electrode, it can display the pH value of the current solution in an accurate numerical manner and is very popular in various industries.
PH test paper has gained wide popularity due to its inaccurate measurement.Wide application. There are a dazzling array of pH meters on the market. Anlailisi Technology Co., Ltd. has 0.1, 0.01 and 0.001 precision, as well as portable, desktop and other machine types of pH meters for you to choose from.
6. What is PH test paper
PH test paper is a A simple tool for measuring the pH of a solution, also known as pH indicator paper or pH test strip. It is usually a small strip of paper with different colors that change depending on the pH of the solution being tested. PH test paper is tested by coating it with a special substance, usually an indicator (such as phenolphthalein, bromophenol blue, etc.). They are a simple and affordable test commonly used in laboratories, hospitals and homes to measure the pH of water, food, cosmetics, soil and more.
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