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​.

​

​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

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?

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.