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Product Details
Feature：
pH test paper is a kind of test paper mixed with various indicators to detect acid and alkali substances. There are 14 color cards to judge the pH value content. Different pH content has different color changes. The smaller the number, the stronger the acidity and the higher the value. The higher the value, the stronger the alkalinity. The unit of the wide-ranging test paper is "1", so the reading of acidic substances with a solubility of less than 0.01% cannot be read.
pH test paper is a kind of test paper mixed with various indicators to detect acid and alkali substances. There are 14 color cards to judge the pH value content. Different pH content has different color changes. The smaller the number, the stronger the acidity and the higher the value. The higher the value, the stronger the alkalinity. The unit of the wide-ranging test paper is "1", so the reading of acidic substances with a solubility of less than 0.01% cannot be read.
Specification：
A set of 80 test papers
Storage: The test paper should be stored in a dry place away from light, and cannot be re-stored in acid-alkaline air.
A set of 80 test papers
Storage: The test paper should be stored in a dry place away from light, and cannot be re-stored in acid-alkaline air.
List：
2 set of pH test strips (160 x test strips)
2 set of pH test strips (160 x test strips)
How to use pH test paper 1-14
Step 1: Open the packaging bag of the test paper to reveal a yellow strip of paper, the paper is pH test paper, there are 1-14 color cards on the surface of the box, and this color card is the pH standard color card;
Step 2: Take out the test paper and lay it flat on the dry glass or plastic sheet (note: the glass or plastic sheet must be dry and clean);
Step 3: Use a glass rod or a pipette to take the solution to be tested and drop it on one end of the test paper;
Step 4: After one second, the solution part of the test paper and the test paper have a color change. At this time, compare it with the standard color card and read the pH value. During the detection, the smaller the pH value, the stronger the acidity of the solution, the stronger the pH value. When it is 7, the solution is neutral, and the greater the pH value, the stronger the alkalinity of the solution;
Precautions for use: During the test, first tear off a small piece of the test page, use a glass rod, cotton swab or other sharp object to dip a small amount of the object to be tested, drop it on the test page, see the color change, and then compare it with the color guide. Color classification, you can know the PH value.
Step 1: Open the packaging bag of the test paper to reveal a yellow strip of paper, the paper is pH test paper, there are 1-14 color cards on the surface of the box, and this color card is the pH standard color card;
Step 2: Take out the test paper and lay it flat on the dry glass or plastic sheet (note: the glass or plastic sheet must be dry and clean);
Step 3: Use a glass rod or a pipette to take the solution to be tested and drop it on one end of the test paper;
Step 4: After one second, the solution part of the test paper and the test paper have a color change. At this time, compare it with the standard color card and read the pH value. During the detection, the smaller the pH value, the stronger the acidity of the solution, the stronger the pH value. When it is 7, the solution is neutral, and the greater the pH value, the stronger the alkalinity of the solution;
Precautions for use: During the test, first tear off a small piece of the test page, use a glass rod, cotton swab or other sharp object to dip a small amount of the object to be tested, drop it on the test page, see the color change, and then compare it with the color guide. Color classification, you can know the PH value.
Common problem
Question 1: Why doesn't the test strip change color?
Answer: Because the test strip itself is yellow, the corresponding pH is 6 (weak acidity). If the pH of the tested liquid is 6, the test strip is unlikely to change color (or the change is very small), and it is not allowed to change color. . This kind of non-discoloration is common in cosmetics, because the skin is weakly acidic, and general cosmetics are weakly acidic close to the skin (you can test the common orange juice, water, soap, etc. at home...)
Question 1: Why doesn't the test strip change color?
Answer: Because the test strip itself is yellow, the corresponding pH is 6 (weak acidity). If the pH of the tested liquid is 6, the test strip is unlikely to change color (or the change is very small), and it is not allowed to change color. . This kind of non-discoloration is common in cosmetics, because the skin is weakly acidic, and general cosmetics are weakly acidic close to the skin (you can test the common orange juice, water, soap, etc. at home...)
Question 2: How to measure that everything is a color?
Answer: 1. First of all, the ph value of question 1 is 6, and the test paper cannot change color. 2. For example, the ph value of the liquid measured by everyone is very close, such as bath water, tap water, mineral water, and large buckets of water. Although the names of the liquids are different, the ph values are the same, so the color displayed is the same, even if there is a difference of 0.1, the test paper cannot be measured.
Answer: 1. First of all, the ph value of question 1 is 6, and the test paper cannot change color. 2. For example, the ph value of the liquid measured by everyone is very close, such as bath water, tap water, mineral water, and large buckets of water. Although the names of the liquids are different, the ph values are the same, so the color displayed is the same, even if there is a difference of 0.1, the test paper cannot be measured.
Question 3: Why can't I measure oil?
Answer: Because acid-base is to measure the hydrogen ion content in the aqueous solution, oil (and oily things) cannot dissociate hydrogen ions, so there is no acid-base.
Answer: Because acid-base is to measure the hydrogen ion content in the aqueous solution, oil (and oily things) cannot dissociate hydrogen ions, so there is no acid-base.
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