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Universal Indicator Paper - 30 Pcs. Universal Indicator Paper Ph 0-12.3.01.05.9999Descriptionin Chemistry, There Are Substances That Have The Ability To Change Their Color In The Presence Of Acids And Alkalis. These Substances Are Called Indicators And Are Used To Determine The Reaction Medium. The Environment Can Be Acidic, Alkaline And Neutral.Filter Paper Is Impregnated With These Substances. There Are Many Types Of Different Indicator Papers, More Precisely Indicators, With Which The Paper Is Impregnated (Litmus, Phenolphthalein, Methyl Orange, Etc.). Indicators Also Include Juice From Red Cabbage, Cherries And Chokeberries. The Paper Is Impregnated With A Solution Of A Mixture Of Indicators And, Therefore, It Turns Different Colors In Different Environments. To Determine The Acidity Or Alkalinity Of A Medium, You Can Use A Piece Of Paper Soaked In A Solution Of Any Indicator. In Nitric Acid, The Paper Changed Its Color To Dark Red. There Are Other Acids In Which The Paper Changes Its Color To Red. These Are Sulfuric Acid, Hydrochloric Acid, Etc. These Acids Are Called Strong Acids. And Such Acids As Acetic, Citric, Tartaric, Etc., Which Mainly Belong To A Large Class Of Chemical Substances - Organic, Are Called Weak. In Such Acids, The Paper Turns Pink.This Means That Using Indicator Paper You Can Determine Strong And Weak Acids If They Have A Solution Of Approximately The Same Concentration.In An Alkali Solution, The Paper Changes Its Color To Blue. Use Caution When Working With Alkalis. Alkalis Also Include Lime Water And Ammonia, Which Is Incorrectly Called “Alcohol.” This Is Its Common Name. This Substance Is Correctly Called Ammonium Hydroxide.You Need To Protect Your Eyes And Hands From Alkalis, They Spoil The Paint And Leave Indelible Stains On The Table.Product Requirements:The Product Must Be Previously Unused, Of High Quality And Fully Comply With The Customer’S Technical Requirements.