Chemistry 4.2.7

Question 1

What Determines how Strong or Weak an Acid is?

Answer 1

How many H+ Ions they Produce when they Dissolve in Water.

Question 2

When added to Water, Acids Ionise, or ___, to Produce H+ Ions.

Answer 2

Dissociate.

Question 3

Strong Acids, such as HCL & H2SO4, Dissociate ___ in Water, Producing Solutions with a ___ Concentration of H+ Ions, & thus a very ___ pH.

Answer 3

Completely, High, Low.

Question 4

Weak Acids, such as Ethanoic Acid, only partially Ionise/Dissociate in Water, Producing pH values between…

Answer 4

4-6.

Question 5

For Weak Acids, there is an ___ Set-up between the Molecules & their Ions once they have been added to Water.

Answer 5

Equilibrium.

Question 6

Each Change of 1 on the pH Scale Represents a Change in Concentration by a Factor of…

Answer 6

10.

Question 7

Even if the Concentration of Strong Acid HCL is Lower than of Weak Acid Ethanoic Acid, the pH Will be ___. Why is this?

Answer 7

This is Because you know that whenever HCL is Added to Water, it will Ionise Completely, meaning it will Produce the Maximum Amount of H+ Ions that it Possibly Can.

However, Weak Ethanoic Acid will Only ever Ionise Partially, so will Always have a Less Acidic pH: Produces Less H+ Ions.

Remember, pH is Measure of Concentration of H+ Ions in Solution, not Conc. of the Acid Molecules.