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

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

• an acid

• an alkali

• a neutral substance

• none of the above

Tags

NGSS.MS-PS1-2

When the cabbage juice indicator comes into contact with acid, the colour changes from_____________________.

Tags

NGSS.MS-PS1-2

When the cabbage juice indicator comes into contact with alkali, it changes colour from___________________.

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

• Acid

• Base

• Neutral

• Strong Acid

Which of the following did you NOT need to use when making red cabbage indicator?

• Filter paper

• bunsen burner

• glass rod

• conical flask

• evaporating basin

What colour is Universal Indicator paper when neutral

• red

• green

• blue

Which of the following statements about litmus and universal indicator are true?

• Universal indicator can determine the strength of an acid or base, whereas litmus cannot.

• Litmus gives qualitative data while universal indicator provides quantitative data.

• Both litmus and universal indicator test solutions not solids.

• All these statements are correct.

What color would you expect an acidic solution to turn if universal indicator was added to it?

• Yellow

• Dark Green

• Blue

• Violet

What is the primary function of an indicator in a chemical reaction?

• To speed up the reaction

• To change the temperature

• To indicate the presence of an acid or base by changing color

• To form a precipitate