pH Scale And Salts, REQ.PRAC

Question 1

Examples of neutral

Answer 1

Water

Blood

Question 2

Examples of alkalis

Answer 2

Limewater (12)
Sodium hydroxide (14)

Question 3

When a substance dissolved in water, they _____ into their individual ions:

Answer 3

DISSOCIATE

• hydroxide ions OH-(aw), makes solutions alkaline
• Hydrogen ions H+(aq), makes solutions acidic

Question 4

Acid + metal hydroxide ->

Answer 4

Salt + water

NEUTRALISATION REACTION

Question 5

Acid + metal carbonate->

Answer 5

Salt + water +co2

Question 6

Method of preparation of a pure, dry sample of a soluble salt from an insoluble oxide or carbonate

Answer 6

1) add metal oxide/carbonate to a warm solution of acid until no more will react
2) Filter the metal oxide/carbonate to leave a solution of the salt
3) gently warm the salt solution so that the water evaporates and crystals of salt are formed

Question 7

Hazards

Answer 7

-corrosive acid can cause damage to eyes, so eye protection must be used

Question 8

Strong acids are

Answer 8

Completely IONISED (split up into ions) in water

Question 9

Strong acids such as _____ are completely ionised in water. Weak acids such as ________ are only partially ionised in water

Answer 9

1) hydrochloric, nitric and sulfuric avid

2) ethanoic, citric, carbonic acid

Question 10

pH of a solution is just a measure of

Answer 10

Concentration of H+ ions