PRE-LAB ASSESSMENT: pH Measurements & its applications

The pH of black coffee is around 5. Is it acidic, basic, or neutral?

• acidic

• basic/ alkaline

• neutral

If Pak Abu does a soil pH test and finds that the pH is 7. Is the pH acidic, neutral, or basic?

• acidic

• neutral

• basic/ alkaline

A chemist tests the water pH for the fish tank and finds that the pH is 8. Is the pH acidic, basic, or neutral?

• acidic

• basic/ alkaline

• neutral

For each unit of pH, the hydrogen ion concentration increases by_____?

• 2

• 10

• 15

• 20

Do acids or bases have a higher hydrogen ion concentration?

• acids

• bases

You test a sheet of litmus paper on some tap water and the strip turns light green, what is the pH?

• 6

• 7

• 8

• 9

Which of the following is not a reason why pH strips are used in agriculture?

• testing water in tanks at fisheries

• testing soil pH so that plants have the nutrients they need

• testing milk the pH of milk at dairy farms

• All of the above are examples of how pH might be used in agriculture.

If a substance A has a pH of 8 and substance B has a pH of 6. Which one is made up of more hydrogen ions?

• Substance A, because it's basic.

• Substance B, because it's acidic.

• Substance A, because it's acidic.

• Substance B, because it's basic.

Which symbol of K represents the dissociation contant of weak acids?

• K_a

• K_b

• K_c

• K_p

Which statement(s) is / are true about pH?

• A scale used to specify the acidity or basicity of an aqueous solution.

• Acidic solutions (solutions with higher concentrations of H⁺ ions) are measured to have higher pH values than basic or alkaline solutions.

• The pH of aqueous solutions can be measured with a glass electrode and a pH meter, or a color-changing indicator.

• pH = log [H⁺]