Acids and Bases

What is pH ?

• Concentration of Hydrogen ions

• Concentration of ions

pH is measured on a scale from

• 0-7

• 5-10

• 0-14

• 7-14

pH of 7 has/is

• more alkaline

• more acidity

• neutral

An acidic solution has a

• higher concentration of hydrogen ions than hydroxide ions

• higher concentration of hydroxide ions than hydrogen ions

• equal concentration of hydrogen ions and hydroxide ions

A basic ( alkaline ) solution has a

• higher concentration of hydrogen ions than hydroxide ions

• equal concentration of hydroxide ions and hydrogen ions

• higher concentration of hydroxide ions than hydrogen ions

If an acid is combined with a base of equal strength, the result will most likely be

• a neutral solution.
• a stronger acid.
• impossible to tell without testing the pH.
• a stronger base

Tags

NGSS.MS-PS1-2

Which of the following is a base?

• orange juice
• water
• vinegar
• dishwashing detergent

Which of the following statements is correct?

• Blue litmus paper turns red when placed in a base.
• Red litmus paper turns blue when placed in a base.
• Blue litmus paper stays blue when placed in an acid.
• Red litmus paper stays red when placed in a base.

Tags

NGSS.MS-PS1-2

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue.
The substance in the beaker

• is a base.
• has a neutral pH.
  
• is an acid.
• does not have a pH.

 Which of the following is an acid?

• shampoo
• baking soda
• orange juice
• water

Tags

NGSS.HS-PS1-1