Acids and Redox

Question 1

difference between weak and strong acid

Answer 1

weak acid partially dissociates in solution equations with ⇌ because forward reaction incomplete
strong acids release all their hydrogen atoms into solution so fully dissociate

Question 2

definition of base

Answer 2

neutralises an acid to form a salt, proton acceptor

Question 3

definition of alkali

Answer 3

Soluble base that releases hydroxide ions in a solution

Question 4

neutralisation of acids with alkalis and metal oxides or metal hydroxides products vs neutralisation with carbonates

Answer 4

neutralisation with alkalis/metal hydroxide : salt and water

neutralisation with carbonates: salt, water and carbon dioxide

Question 5

what can titrations be used for

Answer 5

finding the concentration of a solution
identification of unknown chemicals
finding the purity of a susbtance

Question 6

how to prepare a standard solution

Answer 6

solid is weighed accurately
solid is dissolved in beaker using a little distilled water
solution is transferred to volumetric flask
flask is filled to graduation line until bottom of meniscus lines up with mark
volumetric flask is inverted to mix solution

Question 7

how to calculate water of crystallisation .xh20

Answer 7

work out mass of water
work out mols of water
work out mols of anhydrous salt
divide mols of anhydrous salt by mols of water

Question 8

Concentration

Answer 8

How much solute dissolved in 1dm3 of a solution

Moles/ volume

Question 9

Disproportionation

Answer 9

When same species is both oxidised and reduced

Question 10

O oxidation no (3)

Answer 10

• 2
• 1 in peroxide (H2O2)

+2 when bonded to F

Question 11

H oxidation number (2)

Answer 11

+1

-1 in metal hydrides