Red Cabbage Indicator Ph Scale
The different shades of colour will depend on the strength of the acid or alkali. In this episode we will be creating a ph indicator acid base indicator using red cabbage.
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Welcome to the fourth episode of season 2 of the sci guys.
Red cabbage indicator ph scale. This liquid is at about ph 7. Red cabbage contains a chemical called anthocyanin that changes color depending on the acidity of its environment. In science ph is a scale used to measure how acidic or basic alkaline a substance is.
Cover the cabbage and turn on the food processor until the cabbage is fully blended. In short substances are deemed acidic if they have a ph lower than 7 and alkaline if they have a ph higher than 7. Add 1 cup of water to the red cabbage in the food processor.
Red cabbage indicator scale results. Because red cabbage has this indicator pigment it is possible to determine the ph of a. This is your ph indicator.
Indicators are chemicals which change colour at different acidities or alkalinities allowing us to determine whether a substance is acidic or alkaline. Filter out the plant material to obtain a red purple bluish colored liquid. Pour about 50 100 ml of your red cabbage indicator into each 250 ml beaker.
The scale is technical ly open ended but since most substances have a ph somewhere between 0 and 14 that s usually how. If there is no colour change the substance is said to be neutral. Red cabbage gets its colour from compounds called anthocyanins in its leaves.
Remove the strainer and set aside. The exact color you get depends on the ph of the water. It is neither basic or acidic.
A ph less than 7 means the solution is acidic while a ph greater than 7 means the solution is basic. How does ph indicator work. These instructions explain the simple process of how to make an indicator solution from the leaves of a red cabbage also called purple cabbage and how to make indicator paper by soaking a.
In this case of red cabbage indicator the colour will change from purple to red if it is an acid and from purple to green if it is an alkali. Red cabbage ph indicator years 8 9 overview. Place a strainer over a bowl and dump the blended red cabbage into the strainer.
Omplete this experiment before the reacting sherbet experiment. The lower the ph the more acidic a solution is. When the indicator comes in contact with a substance the indicator s color corresponds to that substance s approximate ph which is a scale of zero to fourteen with zero being the most acidic seven being neutral and fourteen being the most basic that indicates the acidity or basicity of a substance.
Alternatively you can place about 2 cups of cabbage in a blender cover it with boiling water and blend it. You should now have a bowl of red cabbage extract.
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