Skip to main content

Site Navigation

Your Account

Choose Language

2.0

Major VersionM

by Procheta Mallik

Introduction

Turmeric powder is an excellent base-indicator, thanks to its active ingredient, curcumin. See what happens when it interacts with an alkaline substance!

Video Overview

    • Handle acidic and basic substances with care.

    • Do not inhale or ingest any of the materials.

  1. Take the fat straw, measure and cut a 5.8 cm piece. Fold 1 cm of the straw and tape it. Now your straw’s length should be 4.8 cm and its volume should be about 2 ml. This is our measurement unit, to be used to put the chemicals in the next steps.
    • Take the fat straw, measure and cut a 5.8 cm piece.

    • Fold 1 cm of the straw and tape it. Now your straw’s length should be 4.8 cm and its volume should be about 2 ml.

    • This is our measurement unit, to be used to put the chemicals in the next steps.

    • One Unit can approximately contain 0.6g of turmeric and 0.9g of lime.

  2. Add one unit ( 0.9 g) of calcium oxide (CaO), also known as lime powder (or chuna), to a paper cup. Then add 6 ml of water to it using a dropper. Add two units (1.8 g)  of turmeric (haldi) to the container. Observe the colour of the mixture.
    • Add one unit ( 0.9 g) of calcium oxide (CaO), also known as lime powder (or chuna), to a paper cup. Then add 6 ml of water to it using a dropper.

    • Add two units (1.8 g) of turmeric (haldi) to the container.

    • Observe the colour of the mixture.

    • Take the red paste prepared and keep it aside for drying, leaving a little bit in the container.

  3. Make the citric acid solution with a pinch of citric acid crystals in 3 ml of water (measured with a dropper). On the remaining paste, put 3-4 drops of acid solution; the reddish paste should turn yellow... More concentrated the acid, faster the red turns to yellow.
    • Make the citric acid solution with a pinch of citric acid crystals in 3 ml of water (measured with a dropper).

    • On the remaining paste, put 3-4 drops of acid solution; the reddish paste should turn yellow...

    • More concentrated the acid, faster the red turns to yellow.

  4. The paste on the filter paper becomes a deep reddish-brown powder: vermilion (kumkum), after a few hours of drying...
    • The paste on the filter paper becomes a deep reddish-brown powder: vermilion (kumkum), after a few hours of drying...

    • Mix the lime with water thoroughly before adding the turmeric.

    • After a couple of days, the dried vermilion may get a whitish tinge.

  5. Take household materials, note their state (solid, semi-solid paste, liquid ), mix each of them separately with turmeric, and note the colour of the mixture afterwards. Do all of them form red vermilion after addition?
    • Take household materials, note their state (solid, semi-solid paste, liquid ), mix each of them separately with turmeric, and note the colour of the mixture afterwards.

    • Do all of them form red vermilion after addition?

    • Tabulate the materials, state (solution, semi-liquid) and nature (acid or base) as shown in the first table.

    • To the "lime-turmeric" vermilion, add drops of citric acid solution and note the colour. Then add drops of baking soda water; does the colour change back?

    • Test the vermilion with different materials from the first table. Note the colour change. Tabulate as in the second table.

  6. Vary the turmeric quantity, keeping lime, acid and water constant.
Finish Line

Procheta Mallik

Member since: 05/02/2017

284 Reputation

9 Guides authored

0 Comments

Add Comment