acid and alkali

What is the property of the substance based on the change in the colour of litmus paper?

• alkaline

• acidic

• neutral

What is the property of the substance based on the change in the colour of litmus paper

• neutral

• alkaline

• acidic

What is the property of the substance based on the change in the colour of litmus paper?

• acidic

• alkaline

• neutral

Choose one example of alkaline substance

• lime juice

• coffee

• bittergourd

• soda bicarbonate

Besides litmus paper, acidic and alkaline substances may also be tested using extracts of ___________ , ______________ and ___________________ .

• hibiscus extract

• bitter gourd extract

• turmeric extract

• purple cabbage extract

Why does toothpaste have alkaline properties?

• toothpaste can make our teeth become healthy

• toothpaste can neutralise acid in the mouth

Taste and touch are not scientific indicator to the properties of acidic, alkaline and neutral substances. What is the scientific indicator that we can use to test the properties of substances?

• filter paper

• litmus paper

• cabbage extract