Strong and weak acids

Question 1

What happens in water and acids?

Answer 1

Acids make hydrogen ions in water.

HCl = H+ + Cl-

HNO3 = H+ + NO3-

Question 2

What are strong and weak acids?

Answer 2

Strong acids ionise almost completely in water they normally have lower pHs 0-2

Weaker acids do not fully ionise in solution. Their pHs tend to be around 2-6

Question 3

What happens if you change the concentration?

*hint pH

Answer 3

The pH goes up or down depending on how much it was changed

Question 4

What is acid strength?

Answer 4

Acid strength tells you what proportion of the acid molecules ionise in water

Question 5

What does concentration mean?

Answer 5

Concentration is how much acid there is in a litre (1dm3) of water.

Question 6

What does concentration describe?

Answer 6

The total number of dissolved acid molecules

Question 7

How can you tell if an acid is concentrated?

Answer 7

If it has more grams/moles of acid per dm3

Question 8

What happens if the concentration of H+ increases?

Answer 8

If the concentration of H+ ions increases by a factor of 10, the pH decreases by a factor of 1.
So if the H+ ion concentration increases by a factor of 100 (=10*10), the pH decrease by 2 (=1+1)