Acids and redox

Question 1

what does an acid release in solution?

Answer 1

H+ ions

Question 2

what does an alkali release in solution?

Answer 2

OH- ions

Question 3

what is a strong acid? What is the equation?

Answer 3

An acid which completely dissociate in water, non-reversible.

Question 4

what is a weak acid? What is the equation?

Answer 4

An acid which partially dissolves in solution, reversible

Question 5

acid equation

Answer 5

HA + aq = A- + H+

Question 6

What is a base?

Answer 6

A compound which neutralises an acid to form a salt

Question 7

what is a salt?

Answer 7

a compound formed when the H+ ion(s) from an acid have been replaced by a metal ion or ammonium ion.

Question 8

what is a monobasic acid?

Answer 8

an acid which only has one H+ ion to exchange, and can only form 1 type of salt

Question 9

what is a dibasic acid?

Answer 9

an acid which can donate 2H+ ions

Question 10

what is a tribasic acid?

Answer 10

an acid with 3H+ ions to donate

Question 11

acid + metal

Answer 11

makes hydrogen and salt

Question 12

acid + base, plus reaction name

Answer 12

water and salt, neutralisation

Question 13

acid + carbonate

Answer 13

salt, water and carbon dioxide

Question 14

what is a alkali?

Answer 14

A base that dissolves in water releasing hydroxide ions into the solution

Question 15

What is a titration?

Answer 15

A technique used to accurately measure the volume of one solution that reacts exactly with another solution.

Question 16

What are titrations used for?

Answer 16

Finding the concentration of a solution.
Identification of unknown chemicals.

Finding the purity of a substance.

Question 17

What are concordant results?

Answer 17

Within 0.10 cm^3 of each other.

Question 18

When can a mean titre be worked out?

Answer 18

When two or more concordant results are obtained.

Question 19

how to make a standard solution?

Answer 19

1 Weigh the desired amount of solid in a weighing boat
2 Dissolve all the solid in de-ionised water, stirring with a glass rod
3 Without losing a drop, transfer all the solution to a standard flask
4 Rinse out the beaker carefully, pouring everything into the flask
5 Add more de-ionised water up to the mark
6 Stopper and label the flask
7 Agitate the solution by carefully turning it upside down again and again.
8 Re-weigh the empty weighing bottle.

Question 20

% error calculation

Answer 20

max error / measurement x 100

Question 21

what must you always do when calculating error?

Answer 21

add the errors!!!

Question 22

Phenol Phthalein colour change

Answer 22

pink in base and colourless in acid

Question 23

methyl orange colour change

Answer 23

yellow in base and red in acid

Question 24

what is an acid

Answer 24

a species which releases H+ ions in solution.