What is the primary role of indicators in chemistry?

Indicators change color in reactions.

• Show acidity or basicity.

• Visual cues for experiments.

• Essential for titrations.

Litmus is derived from ___ and is used to test for acidity and basicity.

Lichens

True or False: If a substance does not change the color of blue or red litmus paper, it is classified as acidic.

False. If there’s no color change in either litmus paper, the substance is neutral.

Riddle: I change color when I touch acids and bases, I am blue or red, and I help you understand substances. What am I?

Litmus paper

Fill in the blank: If a substance turns blue litmus paper red, it is ___ in nature.

Acidic

What is the process to prepare red rose extract for use as an indicator?

Fresh rose petals are collected, washed, crushed, and soaked in hot water, then filtered to obtain a red-colored liquid.

Short Answer: Name three acidic substances that turn blue litmus paper red.

Lemon juice, amla juice, and vinegar.

How does blue litmus paper react with basic substances?

Blue litmus paper remains blue when exposed to basic substances.

What is the significance of using both blue and red litmus paper in experiments?

Using both allows for the determination of whether a substance is acidic, basic, or neutral based on the color changes observed.

What color change occurs when lemon juice is added to red rose extract, indicating an acidic substance?

The red rose extract changes to a shade of red, indicating the presence of an acidic substance.

Fill in the blank: Turmeric paper turns red when exposed to ___ substances.

Basic

True or False: Neutral substances like sugar solution have no effect on the color of turmeric paper.

True

When soap solution is added to red rose extract, what color change is observed?

The red rose extract changes to a shade of green, indicating the presence of a basic substance.

Fill in the blank: Turmeric is also known as ___ and belongs to the ginger family.

Golden Spice

What type of substances does turmeric paper identify and how does it react to acidic and neutral substances?

Turmeric paper identifies basic substances by turning red; it remains yellow when exposed to acidic and neutral substances.

What are olfactory indicators and how do they function in identifying acidic or basic substances?

Olfactory Indicators

Olfactory indicators change smell in solutions.

• Detects acidity or basicity.

• Onion juice alters scent.

• Useful in chemical identification.

Fill in the blank: Turmeric is often referred to as the ‘___ Spice’ due to its rich color and health benefits.

Golden

True or False: Hydrangea plants produce blue flowers in basic soil and pink flowers in acidic soil.

False. Hydrangea plants produce blue flowers in acidic soil and pink flowers in basic (alkaline) soil.

List two examples of natural indicators that change color in acidic or basic solutions.

Beetroot and purple cabbage are two examples of natural indicators that change color in response to acidic or basic solutions.

Riddle: I am a substance that tastes sour and can be found in lemon juice or vinegar. What am I?

An acid.

What is the significance of the rich golden color of turmeric in Ayurvedic medicine?

Turmeric's color indicates health benefits.

• Symbol of healing properties.

• Key in Ayurvedic remedies.

• Valued for nutritional benefits.

Fill in the blank: Acids turn blue litmus paper ___ and red rose extract ___ when tested.

Red; red

What are the characteristics of bases as described in the content?

Bases feel slippery or soapy, often taste bitter, turn red litmus blue, and change the color of red rose extract to green and turmeric paper to red.