What are the effects of boric acid?

Boric acid is commonly used when applied to glass, so it is normal that many friends are not familiar with it. Boric acid can also be used to control termites, cockroaches, and other harmful insects. Generally speaking, the effects of boric acid are related to chemical products, so do not use boric acid indiscriminately without full understanding of it.

effect

Boric acid was once used by the U.S. Environmental Protection Agency as an insecticide to control cockroaches, termites, fire ants, fleas, silverfish and other pests by affecting their metabolism and corroding their exoskeletons. It can be made into bait containing attractants (sugar, etc.) to kill insects, and using dry boric acid directly has the same effect. If boric acid is used directly, it may run into the cracks in the floor. When insects walk through the cracks, their feet will be stained with boric acid. When they groom themselves (licking with their mouths), they will ingest the boric acid, causing them to die within three to ten days.

Method Name:

Boric acid - Determination of boric acid - Neutralization titration method

Applications:

This method uses neutralization titration to determine the content of boric acid (H3BO3).

This method is suitable for the determination of boric acid.

Principle of the method:

Take an appropriate amount of the test sample, add mannitol and freshly boiled cold water, dissolve it at a slightly warm temperature, immediately cool it to room temperature, add phenolphthalein indicator solution, and titrate with sodium hydroxide titration solution (0.5 mol/L) until it turns pink. Every 1mL of sodium hydroxide titration solution (0.5mol/L) is equivalent to 30.92mg of H3BO3. Calculate and you will get the answer.

Note 1: “Precision weighing” means that the weight should be weighed accurately to one thousandth of the weighed weight, and “precision measuring” means that the accuracy of the measured volume should meet the accuracy requirements of the national standard for the volume pipette.

Note 2: The drying method is used for the "water content determination". Take 2-5g of the sample and spread it flat in a flat weighing bottle that has been dried to constant weight. The thickness should not exceed 5mm, and the looseness should not exceed 10mm. Weigh it accurately, open the bottle cap and dry it at 100-105℃ for 5 hours. Put the bottle cap back on and move it to a desiccator. Cool it for 30 minutes, weigh it accurately, and then dry it at the above temperature for 1 hour. Cool it and weigh it again until the difference between two consecutive weighings does not exceed 5mg. Calculate the water content (%) in the test sample based on the lost weight.