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Acids And Bases Lab Essay

997 words - 4 pages

Acid and Bases LabBy: Ismail MurMs. Iman BukerDate: 10/8/2014Noor Syed, Ridhwaan Anayetullah (Table #3)Purpose: Investigate the acidity of certain substances, and test the buffers of certain acids and bases.Background Research:Buffers: Buffers are important to many things, as they keep a substance's pH steady. They are important to humans, because they keep our blood plasma pH at 7.4 and if it goes too high or too low, that can affect us.Acids: We use pH scales to determine whether something is an acid or not. 0 is the most acidic kind of solution and 14 is the most basic. Battery acids are very acidic. There are also acids in our stomach.Bases: Bases accept hydrogen ions and remove them from solutions. They have a low H+ concentration. Seawater is a kind of base, but pure water is neutral. Bleach and oven cleaner are kinds of bases we use daily.Hypothesis 1: If we use red and blue litmus paper and pH indicator paper, then we can find out whether a substance is an acid, base, or neutral.Hypothesis 2: If we add lemon juice to Milk of Magnesia, Alka- Seltzer, and Rolaids, then we can make the solution neutral.Materials:pH indicator paperTest SubstancesGogglesSmall beakers or cupsRed and Blue Litmus PaperThree samples of antacids150 ml beakersGraduated cylinderspH SensorsLemon Juice SolutionStirring rodPipettesProcedure:Place a small amount of the solution in the beaker. Label the beaker.Dip a strip of red and blue litmus paper into the substance and record the color results and determine whether it is an acid, base, or neutral. Blue=Base, Red=Acid.Dip a strip of pH indicator paper into the substance and compare the color to the color chart on the container. Record the pH value and determine if its and acid, base, or neutral.Clean beaker well, and repeat steps 1-3 for all the test solutions.Part 2:Part 1: Milk of MagnesiaGet a 50 ml beaker and pour in 20 ml of milk of magnesiaTake the initial pH of the antacid with pH indicator paper. Record dateTake the pH of lemon juice solution with pH indicator paper and record in chart.Add 1.0 ml of the antacid solution into the lemon juice using a graduated pipette. Stir and record the pH using pH indicator paperKeep adding 1.0 ml of the antacid solution until the solution reaches pH 7Part 2: Alka-SeltzerPour 50 ml of water into a 150 ml beakerAdd two Alka-Seltzer tablets allow them to dissolve.Take initial pH using pH indicator paper record the pH.Take the pH of lemon juice solution with pH indicator paper.Add 1.0 ml of the antacid solution into the lemon juice using the pipette. Stir with stirring rod and record the pH using pH indicator paper.Keep adding 1.0 ml of the antacid solution until the solution reaches pH 7.Part 3: RolaidsTake four Rolaid tablets and carefully grind them up using a mortar and pestle. Scrape the powdered antacid into a small beaker and add 30 ml of water.Stir well.Record the pH with pH indicator paper.Take the pH of lemon juice with a pH indicator paper and record data.Add 1.0 ml of...

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