Chemical Reactions, Acids, Bases

Which one of these is a substance that releases an H+ ion when dissolved?

• Acid

• Base

• Salt

What are the characteristics of an acid?

• taste bitter, turns litmus paper blue, formula ends in OH

• taste sour, turns litmus paper red, formula begins with H

• caustic, turns litmus paper blue, metal plus non-metal

What happens when you mix an acid with a base?

• it stays an acid

• it stays a base

• neutralization occurs and forms water and a salt

All base formulas end in

• H

• OH

• any ending - it doesn't matter

• H₂O

How can you tell if something is an acid, base or salt?

• use an indicator

• taste it

• mix it with water

• add food coloring

What does an indicator do in the presence of an acid or base?

• only changes color in a base

• only changes color in an acid

• nothing

• changes color in an acid AND a base

What are examples of indicators?

• litmus paper only

• pH paper only

• phenolphthalein only

• All of the above are indicators

If you have a base, what color will the litmus paper turn?

• blue

• red

What does the pH scale measure?

• strength of an acid or base

• the concentration of an acid or base

• the color of the acid or base

An acid on the pH scale would have a pH of

• between 0-6

• 7

• between 7-14

• anywhere on the pH scale. There is not set place for acids.