Acids and Bases and Indicators

​Acids, Bases and Indicators

Review drills for 1st Quarter 1st Half Examination​

It is a substance having a pH of less than 7​.

It often tastes sour.

It is capable of donating H⁺ ion.

It has high electrical conductivity​.

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​ACID

It is a substance having a pH of more than 7​.

It often tastes bitter.

It is capable of donating OH^- ion.

It has high electrical conductivity​.

​

​Base

Fill in the Blank

What do we call the substance that is neither acid nor base?

Fill in the Blank

Fill in the blank: _____ are substances that have a pH of less than 7.

Fill in the Blank

Fill in the blank: _____ are substances that have a pH of more than 7.

Fill in the Blank

Fill in the blank: Acids mostly have ____ taste.

Fill in the Blank

Fill in the blank: Bases mostly have ____ taste.

Fill in the Blank

What does pH stand for?

Draw

Encircle the pH range of a neutral substance.

Draw

Encircle the pH range acids.

Draw

Encircle the pH range bases.

Multiple Choice

Which of the following pH is of a weak acid?

• 1

• 6

• 8

• 14

Multiple Choice

Which of the following pH is of a strong acid?

• 2

• 5

• 9

• 13

Multiple Choice

Which of the following pH is of a strong base?

• 0.5

• 6.9

• 7.5

• 13.5

Multiple Choice

Which of the following pH is of a weak base?

• 0

• 6.0

• 7.5

• 14

Multiple Choice

Which of the following is NOT a property of base?

• slippery to the touch

• conducts electricity

• tastes bitter

• burns skin

Multiple Choice

Which of the following is a property of an acid?

• slippery to the touch

• conducts electricity

• tastes bitter

• turns red litmus paper blue

​It is a substance which change color with pH.

​​Indicator

​

​This helps us identify whether the substances are acids, bases or neutral

Open Ended

What plants can be used as indicators?

Fill in the Blank

What substance is present in purple plants that is a good indicator?

Fill in the Blank

What plant-like organisms are mostly used as acid-base indicator in laboratories?

Multiple Choice

Which plant is NOT a good natural indicator?

Multiple Select

Which of the following plants are good indicators? Choose all that applies.

• Blue ternate flower

• Red Hibiscus(Gumamela)

• Sunflower

• Mango leaves

Draw

Color the circle with the color of an ACID when added with red cabbage.

Draw

Color the circle with the color of vinegar when added with a CURRY POWDER.

Draw

Color the circle with the color of Sprite when added with a RED ONION SKIN.

Draw

Color the circle with the color of a BASE when added with a RED CABBAGE.

Draw

Color the circle with the color of water when added with a YELLOW CURRY POWDER.

Draw

Color the circle with the color of a colorless liquid detergent when added with a RED BEET ROOT.

Open Ended

BONUS: Is coffee an acid or a base? Defend your answer.