Determining Acids And Bases Using Litmus Paper

Into clean cups, pour about 10 to 20 m L of lime juice, lemon juice and vinegar, one liquid to each cup. Tear off a few pieces of alkacid litmus paper about an inch in length and dip the end of one piece into each substance so that you test each cup with its own strip.The acetic acid in vinegar has a p H of approximately 3 and turns the paper orange-red.Add a few more drops and test the solution repeatedly; lay down each strip next to last one and you will notice the strips turning orange and tan instead of red.

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How do you determine if a substance is acidic or basic? Acids lose their acidity when combined with alkalis. Insects like bees, ants, etc have formic acid in their stings. The following are the properties of acids : Bases are substances that substances that are slippery to touch when in aqueous form. They also change the color of red litmus paper to blue. For example, Ammonium Hydroxide, Calcium Hydroxide, etc.

However, there are a few food items that are basic in nature. All acids change the color of blue litmus paper to red. Lactic acid is found in milk and other dairy products.

But from p H papers, the p H range of the solution can be determined.

• So p H papers give more precise readings than litmus papers.

Fill two clean cups halfway with distilled water; mix a gram or two of table salt into one.

Tear two inch-long strips of alkacid litmus paper and dip them into the cups, using one strip per cup.Tear off three pieces of alkacid litmus paper about an inch long and dip them in the liquids, one piece to each cup.The solutions are bases, the strongest of which is the ammonia with a p H of 11; it turns the litmus paper dark blue.What is the difference between Litmus Paper and p H Paper?• Litmus papers can only be used to determine whether the solution is acidic or basic.The borax is weaker, having a p H of about 9; it turns the paper dark green.The sodium bicarbonate solution’s p H is about 8 and it turns the paper green or yellow-green. Acids are molecules or other species that can donate a proton or accept an electron pair in reactions. The word “acid” is derived from the Latin word “acidus” which means tart or sour.Litmus Paper Litmus paper is an indicator, which can be used to determine acidic and basic solutions. Mixture of water-soluble dyes extracted from lichens like Roccella tinctoria are absorbed into filter paper stripes to make litmus paper.In this mixture, there are about 10- 15 types of dyes.


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