pH scale and universal indicator solution | Exit Quiz | Oak National Academy

Match the keyword to the correct statement.

• alkali

• A solution that has a pH of 7.

• pH scale

• Measures the acidity or alkalinity of solutions.

• neutral

• A solution with a pH of more than 7.

• acid

• A solution with a pH of less than 7.

Answer explanation

The pH scale measures acidity or alkalinity of solutions. Neutral is a solution that has a pH of 7. Alkali solutions have a pH of greater than 7. Acid solutions have a pH of less than pH 7.

A bee sting is acidic. What colour would universal indicator turn?

• blue

• green

• red

• purple

Answer explanation

A bee sting would turn universal indicator red.

What does pH stand for?

• potential of hydrogen

• potential of hydroxide

• potential of helium

• potential of harm

Answer explanation

pH stands for potential of hydrogen.

Four solutions were tested with universal indicator. Rank the results in terms of acidity. Place the most acidic solution first.

• orange

• yellow

• red

• blue

Answer explanation

Red is the most acidic solution followed by orange, yellow, then blue would be alkaline.

Select the correct statements about concentration of hydrogen and pH.

• The higher the concentration of hydrogen, the lower the pH.

• The higher the concentration of hydrogen, the higher the pH.

• The lower the concentration of hydrogen, the higher the pH.

• The lower the concentration of hydrogen, the lower the pH.

Answer explanation

The higher the concentration of hydrogen the lower the pH; The lower the concentration of hydrogen the higher the pH.

Solution A has a pH of 8 and solution B has a pH which is 1000 times more alkaline. What is the pH of solution B?

• 11

• 10

• 9

• 7

Answer explanation

Solution B has a pH of 11.