Beetroot a natural indicator PRAC (1 Viewer)

[Itike]

Im doing a prac: "Beetroot: a natural indicator" and need to know "at what pH range does beetroot indicator change colour?".

Thanks.

 

[2opinion8d]

Beetroot indicator changes colour from 5.7 – 12.2

 

[yoakim]

Mmmm, whilst on this topic, anyone have results for the addition of beetroot indicator with HCl acid, distilled water and NaOH base? (Or basically any acid or base?)
I missed out on this prac, and I guess I should get this covered instead of skipping it...
Thanks.

 

[Nesty]

how do you actually use it as a natural indicator if i may ask?

just chop it into pieces and boil it? need to do it as a open investigation.

 

[Itike]

In our prac we just chopped up a beetroot and blended it in a belnder with some water.

 

[yoakim]

Chop it up, mash it with the mortar and pestle, add methanol to break open the plant's cell membranes so that the red/purple dye (forgot what it's called) can escape the cell, collect the dye, then test it on a base, distilled water, and an acid.

But as I didn't collect the results, does anyone else have them? Like, what colour did the base/acid/water change when the beetroot indicator was added?
Thanks.

 

[jest3r]

We used just mashed up some red cabbage with a mortar and pestle and strained it through a filtering apparatus with water, and presto. Acid-base indicator.

 

[2opinion8d]

<O</O
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Indicator<O></O>​

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Water<O></O>​

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NaCl solution<O></O>​

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HCl solution<O></O>​

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NaOH solution<O></O>​

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Beetroot juice​

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Red​

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Slightly lighter red​

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Reddish Blue​

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Yellow​

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[Forbidden.]

We used just mashed up some red cabbage with a mortar and pestle and strained it through a filtering apparatus with water, and presto. Acid-base indicator.

We ripped some flowers from the school's el cheapo garden and we used them as indicators and the more vivid the colour the better its ability to indicate whether a substance is acid or base.

 

[arshjotsingh]

Im doing a prac: "Beetroot: a natural indicator" and need to know "at what pH range does beetroot indicator change colour?".

Thanks.

The pH range for beetroot is usually >10 but it may change according to the concentration of the solution.

 

[Johnw21]

I used red cabbage for this prac and we chopped it and boiled it. then we took the now purple water and used that as an indicator.

 

[brenton1987]

Now I need to research and make 3 indicators myself. I have heaps of food on the list, like berries. I'm having trouble finding HOW to prepare them though, all I find is red cabbage.

You need to extract the pigment. Ground a sample with sand and acetone. Gravity filter. Run thin layer and column chromatography if possible. Dilute.

 

[suryateja07]

METHOD:
1. peel beetroot
2. chop finely
3. put into blender with 100mL of distilled water
(i feel like im giving you a recipie ..lol... n i dont even cook!)
4. strain mixture into beaker
5. 3 identical test tubes with 3mL of the following substances:
1. Hydrochloric acid (HCl) (stong acid)
2. Sodium chloride (NaCl) (neutral)
3. Sodium hydroxide (NaOH) (strong base)
6. place 3 drops of beetroot indicator into each test tube and record colour change

RESULTS (colour change):
HCl - PINK
NaCl - DARK RED
NaOH - YELLOW