EL 9

Question 1

What is an acid?

Answer 1

H+ donor

Question 2

What is a base?

Answer 2

An H+ acceptor

Question 3

What is an alkali?

Answer 3

An OH- donor

Question 4

How do we work out reacting masses?

Answer 4

1) write a balanced equation
2) In words, state what the equation tells you about the amount in moles of the substance you are interested in
3) Change amounts into masses in grams
4) scale the masses to the ones in the question

Question 5

Neutralization reaction

Answer 5

Alkali + acid -> salt

Question 6

Concentration (mol dm-3) =

Answer 6

Concentration (g dm-3) / molar mass (g mol-1)

Question 7

What does concentration of a solution depend on?

Answer 7

The amount of solute
The final volume of the solution

Question 8

What color does methyl orange turn when adding acid to alkali?

Answer 8

Yellow -> red

Question 9

What color does phenolphthalein turn when adding acid to alkali?

Answer 9

Red -> colourless

Question 10

What are concordant readings?

Answer 10

Readings with 0.1 of each other

Question 11

What color is methyl orange at the end point of a titration?

Answer 11

peach/ orange

Question 12

What color is phenolphthalein at the end point of a titration?

Answer 12

Palest possible pink -> colourless

Question 13

Brownsted-Lowry theory

Answer 13

-an acid is an H+donor
- Base is an H+ acceptor