Red Cabbage Indicator Prac Write Up

The ruddy chou index shows how a usual family merchandise such as ruddy chou can do a suited index and be able happen out if a chemical is either and acid. base or impersonal. Acids are a chemical that reacts with an base neutralizing it bring forthing H2O and a salt. Acids are besides normally found to be rancid savoring. Acids react with metals. let go ofing H gas and go forthing behind a salt they besides can carry on electricity. Acids besides readily give off H ions and have a pH degree lower than 7. Some more common research lab acids are Hydrochloric. Sulphuric and Nitric Acids. Sulphuric acids and H2O are used in auto batteries as the electrolyte.

Bases or bases are a chemical that will respond with acids and normally have a slimy or soapy feeling on contact with tegument. Bases readily accept H ions and has a pH degree that is higher the 7. Bases have a acrimonious gustatory sensation and neutralise vitamin D by acids. bring forthing H2O and a salt. Some common research lab bases are Sodium Hydroxide. Potassium Hydroxide and Calcium Hydroxide. Stronger bases are normally used today in many cleansing merchandises.

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Indexs help us happen wether if a chemical is an acid or base. The graduated table that is used to happen wether a chemical is an acid or a base is the pH graduated table. The pH graduated table gives us an indicant of the sum of H ions and goes from 1 – 14. one being the strongest acid and 14 being the strongest base. Many workss and flowers have natural substances which have bespeaking belongingss that allow them to be used as indexs. The ruddy coloring material of ruddy chou comes from a molecule called an anthocyanin. Very acidic solutions will turn anthocyanin a ruddy coloring material. Impersonal solutions result in a purple coloring material. Alkalis solutions appear in greenish-yellow. Therefore. it is possible to find the pH of a solution based on the coloring material it turns the anthocyanin in ruddy chou juice.


< Red chou leaves ( or red flower petals such as clove pink. rose or geranium )

< 250ml beaker

< Hotplate or Bunsen burner. tripod. gauze mat and bench mat

< Descrying tile

< Dilute ( 0. 1M ) Hydrochloric acid

< Dilute ( 0. 1M ) Na hydroxide solution

< Vinegar

< Distilled Water

< Filter

< Jar

< Cloudy Ammonia

< Sodium Chloride

< Lemon Juice

< Shampoo

< Dish lavation detergent


Part A: Making the index

1. The chou leaves were torn up and placed in the beaker

2. The beaker was heated until the H2O was gently boiling. The chou leaves continued to boil until the H2O has been strongly coloured ruddy.

3. The chou leaves were allowed to chill and so to be filtered. strained or pick

Part B: Testing the index

4. The chou H2O was added to all Wellss of the descrying tile and split every bit between them.

5. A known acid and base were placed on a descrying tile on the chou index. The coloring material was record.

6. The staying chemicals were placed on the descrying tile and were recorded as in measure 5

Safety Assessment:

Hydrochloric acid ( HCL ) is a caustic liquid

– Skin contact: Exposer for a short period/s of clip may do annoyance and prolonged exposer may do Burnss

– Eye Contact: Exposer for a short period of clip may do annoyance and may do Burnss.

– Permanent oculus harm may ensue. To avoid any contact with the substance wear:

– Protective Clothing

– Safety Glasses

– Safety Gloves ( Optional )

– Closed places

– Eye contact – instantly hold palpebras unfastened and rinse oculus continuously for five – ten proceedingss

– Skin contact – instantly rinse the affected country under H2O until there is none of the chemical left on the tegument

– Contact with any other chemical should be treated as this one.

– All protective cogwheel listed supra should be used in the experiment in the same manner.

– Hair tied back

– Jewellery to be taken off

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Red Cabbage Indicator Prac Write Up. (2016, Dec 11). Retrieved from