80 Strips PH 1-14 Litmus Paper PH Papers Water Cosmetics Soil Acidity Test Strips Universal Indicator Paper Test

80 Strips PH 1-14 Litmus Paper PH Papers Water Cosmetics Soil Acidity Test Strips Universal Indicator Paper Test

The nature of pH test paper The pH test paper is a test paper for detecting acid and alkaline substances which is a mixture of multiple indicators. There are 14 color cards to determine the pH value content. Different pH content has different color ranges. The smaller the number, the stronger the acidity and the greater the value. Larger, the stronger the alkalinity, the wide-scale test paper takes the accuracy "1" as the unit, so the reading of acidic substances with a solubility of le than 0.01% cannot be read. Storage: The test paper should be stored in a dark and dry place, and it should not be stored in acid-alkaline air. 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 a pH test paper. There are 1-14 color cards on the surface of the box. This color card is a pH standard color card;

Step 2: Take out the test paper sheet and lay it flat on top of a dry gla sheet or plastic sheet (note: the gla sheet or plastic sheet must be dry and clean); Step 3: Use a gla rod or pipette to take the test solution and drop it on one end of the test paper; Step 4: One second later, the solution part of the test paper and the test paper have a color change. At this time, compare with the standard color card and read the pH value. In the test, the lower the pH value, the stronger the acidity of the solution, and the pH value is 7 , The solution is neutral, the higher the pH value, the stronger the alkalinity of the solution; Precautions for use: During the test, first tear off a small piece of test page, use a gla rod, cotton swab or other sharp object to take a small amount of the test object, drop it on the test page, watch the color change, and then compare the corresponding color on the color plate According to the color claification, you can know the PH value. Question 1: Why does the test strip not change color? Answer: Because the test strip itself is yellow, the corresponding pH is 6 (weakly acidic). If the pH of the tested liquid is 6, it is impoible for the test strip to change color (or the change is very small). NS. This kind of discoloration is common in cosmetics, because the skin is weakly acidic, and general cosmetics are close to the weak acidity of the skin (you can test the common orange juice, water, soap, etc. at home.....) Question 2: How to measure what is a color? Answer: 1. First of all, it is impoible to change the color of the test paper if the pH value of the question 1 is 6. 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 name of the liquid is different, the pH value is the same, so the displayed color is the same. Even if there is a difference of 0.1, the test paper cannot be measured. If you want to measure the high precision difference between a few points, please buy a precision pH test paper. Question 3: Why can't the oil be measured? Answer: Because acid-base measures the content of hydrogen ions in the aqueous solution, oil (and oily things) cannot diociate hydrogen ions, so acid-base can't be mentioned.

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