Acids And Bases Flashcards

1
Q

What are alkalis

A

They are based that are soluble in water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What do group 1 metals releases when they react with water

A

Hydroxides

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the problems with the arhenius model

A
  • he only described them in terms of H+ and OH- ions
  • he only describe acids and bases that are in solution
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What happens to Kw when temperature increases

A
  • temperature increases Kw increases because the the ionisation of water is endothermic so the conc of H+ and OH- increases
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When is a solution neutral

A

[H+] = [OH-]

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What does a change in concentration to [H+] or [OH-] do and why

A

It doesn’t affect equilibrium because an increase in the concentration of one leads to the decrease in the concentration of the other leading to Kw being the same

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe a titration.

A
  • rinse pippette with acid/alkali, then fill with pipette filler
  • place 25cm3 of acid/alkali of known concentration in conical flask
  • add few drops of suitable indicator
  • rinse burette with acid/alkali, then fill it
  • record start volume
  • add small portions of acid/alkali from burette
  • stir solution in conical flask
  • add acid/alkali dropwise as you approach end point
  • stop adding acid/alkali when colour change occurs
  • record end volume
  • repeat until 2 concordant results (within 0.10cm3 of each other) are obtained
  • calculate mean titre value
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How do buffers work?

A

Equilibrium reaction removes added H+ and OH- ions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How do you improve accuracy with a pH meter?

A
  • callibrate first using buffer solution of known pH
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Why is the equivalence point not always neutral?

A

salt produced may be basic/acidic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly