UT2 revise

Three unlabelled beakers contain Distilled water, Ammonia and Vinegar

If a blue litmus paper is dipped into beaker C, and it turns red,

Is the liquid in beaker C acidic, neutral or alkaline?

• acidic

• neutral

• alkaline

Three unlabelled beakers contain Distilled water, Ammonia and Vinegar

If a blue litmus paper is dipped into beaker C, and it turns red,

What is the liquid in beaker C ?

• Ammonia

• Distilled water

• Vinegar

Three unlabelled beakers contain Distilled water, Ammonia and Vinegar

If a pH paper is dipped into beaker A, and the pH value is 7,

What is the liquid in beaker A ?

• Ammonia

• Distilled water

• Vinegar

Three unlabelled beakers contain Distilled water, Ammonia and Vinegar

If a blue litmus paper and red litmus is dipped into beaker B, what are the colour change?

• blue litmus paper : no colour change

  red litmus paper : no colour change

• blue litmus paper : change red

  red litmus paper : no colour change

• blue litmus paper :no colour change

  red litmus paper : change blue

waste sample P , pH = 2.85

waste sample Q , pH = 7.52

waste sample R , pH = 12.93

which waste sample should be treated (處理) before discharge(排放) to the sea

• waste sample P ONLY

• waste sample R and

  waste sample Q

• waste sample P and

  waste sample Q

• waste sample P and

  waste sample R

waste sample P , pH = 2.85

waste sample Q , pH = 7.52

waste sample R , pH = 12.93

what should be used to measure pH of the above waste sample

• pH meter

• pH paper

• blue and red litums paper

• universal indicator

How many hydrochloric acid is used in the above neutralization?

• 2cm3

• 7cm3

• 8cm3

If the pH of the solution is 2. What are the following statements 句子 are true

• the solution is neutral

• the solution is corrosive

• It is more acidic than orange juice

pH of solution P = 4

pH of solution Q = 2

• P is more acidic

• Q is more acidic

• P and Q are acidic

• P and Q are alkaline

If the soil is too acidic , what is added to the soil to better plant growth?

• salt

• hydrochloric acid

• sodium hydroxide

• lime