Red Cabbage PH Indicator

Slides:

Advertisements

Similar presentations

Safety in the Lab What is different about this classroom and every other classroom in your school?

Advertisements

General Chemistry Spring 2010

PH, Acids and Bases.

Water molecules can dissociate and ionize when a hydrogen atom shared by two water molecules in a hydrogen bond shifts from one molecule to the other.

Acid and Base Academic Biology Mr. Luis A. Velazquez.

 What is a solution?  What are the differences between unsaturated, saturated, and supersaturated solutions?  What are some of the general properties.

Unit 3 Acids and Bases. Common Acids Sulfuric AcidH 2 SO 4 Nitric AcidHNO 3 Phosphoric AcidH 3 PO 4 Hydrochloric AcidHCl Acetic Acid CH 3 COOH Carbonic.

ACIDS AND BASES. Acids  Acidic solutions contain water and hydrogen ions (H+)

ACIDS and BASES. Why ‘acids and bases’? Scientists like to classify things and donating them as acids or bases is one way to do that. If a solution is.

Acids and Bases And Neutralisation Reactions p

Neutralisation Noadswood Science, 2012.

Red Cabbage Extract as a pH Indicator. Aim Extracting a pH indicator from the red cabbage. Finding the color of the extract to a known pH solution. Determining.

Pg of composition notebook.  Acid: Substance that donates Hydrogen ions (H + ) to a solution.  Or forms H 3 O + (hydronium ions) with water 

Acids and Alkalis Learning Objectives To know that solutions can be sorted by whether they are: acid, alkali or neutral. To understand that an alkali reacts.

RED CABBAGE PH INDICATOR. THE PURPOSE OF THIS EXPERIMENT IS TO SHOW HOW TO MAKE YOUR OWN PH INDICATOR USING CABBAGE JUICE.

Unit 4 Acids, Bases and pH. Water molecules dissociate and ionize to form H 2 0  H + + OH - Water  hydrogen ion + hydroxide ion In pure water, there.

Acidity and Alkalinity How do we tell an acid from a base and what is it good for?

Acids and Bases Chapter 15. Acids a substance which when added to water produces hydrogen ions (H + ) hydronium (H 3 O + ) is created Water + Hydrogen.

ACIDS, BASES, & SALTS ACIDS Contain hydrogen ions, H + also called hydronium ions, H 3 O + Taste sour (remember not to taste chemicals as a rule) Dangerous.

Acids and Bases.

 Sour in taste  Produce H+ (hydrogen ions)  Turns blue litmus red  Acids + metals salt + hydrogen gas  Conduct electricity  are corrosive (acid.

pH Scale Neutral = 7.0 (Water)

Lab 25Date: Red Cabbage Indicator Purpose To prepare and test red cabbage as an indicator. Red cabbage and many other plants contain a water-soluble pigment.

Acids & Bases. pH scale Ranges from 0-14 Ranges from – 6 = Acid 0 – 6 = Acid 0 is most acidic 0 is most acidic Concentration of H + (hydrogen or.

Jen Rosenthal. Where might you find them? Are all acids & bases harmful? What foods do we eat or drink that may be acids/bases? How can we tell the difference.

ACID BASE AND SALT. ACID An acid is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a hydrogenion.

Unit 3 Acids and Bases.

Acids and Bases. Acids An acid is a substance that: An acid is a substance that: Tastes sour Tastes sour Oily feeling Oily feeling Reacts with metals.

Acids, Bases, and pH Ch. 23 Chapter 6.3. What are Acids?  Donate hydrogen ions, H+  Forms H 3 O+( hydronium ion) when dissolved in water  Tastes sour-ex.

Acids & Bases Chapter 9. Arrhenius Acid DEFINITION Any substance that releases hydrogen ions in water. Any substance that releases hydrogen ions in water.EQUATION:

Acids and Bases Chapter 32.

11/04/13.  Can you give an example of a strong acid, what would its pH value be?  Do you think citrus acid found in fruits is a strong acid, what do.

Purpose: To test the pH of different solutions using cabbage juice.

They Are Everywhere.  Common Acids Hydrochloric AcidHClStomach Acid Ascorbic AcidC6H8O6C6H8O6 Vitamin C Phosphoric AcidH 3 PO 4 Fertilizers and Detergents.

Chapter 20 pH. Water forms ions H 2 O ----> H + + OH - Water splits apart into hydrogen ions (H+) and hydroxide ions (OH-). This process is called self-ionization.

Acids and Bases.

1. ACIDS AND BASES Name some acids and bases that are familiar to you. 2.

UNIT 11 ACIDS, BASES & SALTS Ch. 8.

Chapter 19 “Acids, Bases, and Salts”. Properties of Acids n They taste sour (don’t try this at home). n They can conduct electricity. –Can be strong or.

Acids and Bases Name some acids and bases that are familiar to you.

Objectives l PSc –Summarize the characteristics and interactions of acids and bases.

Acids, Bases & pH. Acids Has positive hydrogen ions (H+) Has positive hydrogen ions (H+) Sour Taste Sour Taste Reacts with Metals and Carbonates Reacts.

Acids and Bases. Acids An acid is a substance that: An acid is a substance that: Tastes sour (dangerous) Tastes sour (dangerous) Oily feeling (dangerous)

Acids, Bases, and Salts. Properties of Acids Taste sour. Conduct electricity. Can be strong or weak electrolytes in aqueous solution React with metals.

ACIDS AND BASES REVISION Q3. A STUDENT HAS THREE UNLABELLED BEAKERS EACH CONTAINING A COLOURLESS LIQUID. ONE CONTAINS WATER, ONE CONTAINS A SOLUTION OF.

Acids and Bases. Acids An acid is a substance that: An acid is a substance that: Tastes sour (dangerous) Tastes sour (dangerous) Oily feeling (dangerous)

Acid and Base Research Biology Mr. Luis A. Velázquez.

Red Cabbage pH Indicator

Acids and Alkali Alex Cheong 1P404.

Acids, Bases, and pH.

Acids and bases F Acids and bases pH — measuring acidity

Acid and Base Jeopardy! Begin.

Red Cabbage Indicator Year 7 Science.

Bell Ringer To measure the amount of concentration, you compare the amount of solvent and _______. To change the concentration you can add solute.

ACIDS A substance that produces HYDROGEN (H+) or HYDRONIUM (H3O+) ions in solution.

PH scale A. A measurement system to indicate the concentration of H+ (hydrogen ions) 1. The pH scale ranges from Water is made up of H+ and OH-

Testing for pH.

Acids and Bases.

Physical Science Acids, Bases, & pH.

Warm Up Take out your notes and practice problems on Types of reactions. Review and get ready for a quiz.

Starter: Describe in detail how we can we test to see if a liquid is an acid or an alkali? Extension: Explain the difference between a base and an alkali.

Aims of the Lesson I know that it is possible to make indicators to test for acids/alkalis from substances that could be found in the home. Indicators.

Acids and Bases.

Acids and Bases Mrs. Leos.

Describing Acids and Bases

Describing Acids and Bases

Presentation transcript:

Red Cabbage PH Indicator GÜNEŞ KANAR 10C-70

Preview information; Red cabbage contains a pigment molecule called flavin (an anthocyanin). This water-soluble pigment is also found in apple skin, plums, poppies, cornflowers, and grapes. Very acidic solutions will turn anthocyanin a red color. Neutral solutions result in a purplish color.

Basic solutions appear in greenish-yellow Basic solutions appear in greenish-yellow. Therefore, it is possible to determine the pH of a solution based on the color it turns the anthocyanin pigments in red cabbage juice. The color of the juice changes in response to changes in its hydrogen ion concentration. pH is the -log[H+]. Acids will donate hydrogen ions in an aqueous solution and have a low pH (pH < 7). Bases accept hydrogen ions and have a high pH (pH > 7).

Materials: These are the materials that we are using during the experiment. red cabbage blender or knife boiling water filter paper One large glass beaker Six 250 mL beakers household ammonia (NH3) baking soda (sodium bicarbonate, NaHCO3) washing soda (sodium carbonate, Na2CO3) lemon juice (citric acid, C6H8O7) vinegar (acetic acid, CH3COOH) seltzer water (carbonic acid, H2CO3) muriatic acid or masonry's cleaner (hydrochloric acid, HCl) lye (potassium hydroxide, KOH or sodium hydroxide, NaOH)

Procedure; Chop the cabbage into small pieces . Place the cabbage in a large beaker and add boiling water to cover the cabbage. Allow at least ten minutes for the color to leach out of the cabbage. Filter out the plant material to obtain a red-purple-bluish colored liquid. This liquid is at about pH 7.

Pour about 50 - 100 mL of your red cabbage indicator into each 250 mL beaker. Add various solutions to your indicator until a color change is obtained. Use separate containers for each household solution . Be amazed as the beautiful colors dazzle and delight your eyes.

Results: Your red cabbage juice is a simple pH tester. It reacts differently to different substances. Once you know what colour the juice turns in acids and alkalis, you can use it to test other liquids.

Why It Happens: Red cabbage has pigments which react differently to acids and alkalis. When you dip the strips into a substance and wait for a few minutes, the colour will fully develop. The indicator strips turn red-yellow in acid, green in neutral and purple-blue in alkali.

END ........