PH Indicators

An indicator will ______________ when it is in contact with an acid or base

• Bubble
• Form a new substance
• Change color
• Stay the same color

What is a substance that is one color in an acid and another color in a base? 

• Oxidizer
• Indicator

What color does litmus paper turn in the presence of an acid?

• Red
• Blue

The pH of a strong acid would be:

• 1-2
• 5-6
• 8-9
• 12-13

The pH of a strong base would be:

• 1-2
• 5-6
• 8-9
• 13-14

The pH of a weak base would be:

• 1-2
• 5-6
• 8-9
• 12-13

The pH of a weak acid would be:

• 1-2
• 5-6
• 8-9
• 12-13

According to the image, the substance tested is a...

• Acid
• Neutral
• Strong Acid
• Base

Examine the results (color change) of the pH paper shown in the picture.  What type of substance was tested?

• an acid
• a base
• a neutral substance
• none of the above

Tags

NGSS.MS-PS1-2

One benefit of Red Cabbage Juice Indicator is that it...

• Tells you the exact pH 
• Is very accurate
• It is very expensive
• It can be made from materials you have at home