Acids in general

Question 1

what is an acid?

Answer 1

Produces H+ ions when it dissociates in a solution.
an acid is any aqueous solution with a pH less than 7

Question 2

what is an alkali?

Answer 2

Produces OH- ions when it dissociates in a solution.
(an acid is any aqueous solution with a pH greater than 7 )

ALL ALKALIS ARE BASES BUT NOT ALL BASES ARE ALKALIS

Question 3

how will you know when the reaction is complete?

Answer 3

Effervescence stops

Question 4

making copper sulfate using carbonates

Answer 4

stage 1:
-heat acid gently
-add access metal oxide
-colour change (colourless to blue)

stage 2 (filtration)
-excess metal oxide is separated by filtration
-filtrate is is used for crystalisation

stage 3 (crystalisation)
-salt solution is placed in evaporating bason and heated to evaporate water
-product is left at room temperature to crystalised

Question 5

a metal oxide is…

Answer 5

insoluble

Question 6

what to use to help us tell if something is an acid or alkali

Answer 6

universal indicator

Question 7

a strong acid…

Answer 7

has a high concentration of H+ ions

Question 8

a weak acid…

Answer 8

has a low concentration of H+ ions

Question 9

what ions do acids contain

Answer 9

Hydrogen

Question 10

what ions do alkalies contain

Answer 10

Hydroxide ions

Question 11

what is neutralisation

Answer 11

reaction of Hydrogen and hydroxide ions, to produce water
(acid + alkali = water + salt)

Question 12

all acids are

Answer 12

aqueous

Question 13

test for hydrogen

Answer 13

squeaky pop

Question 14

test for CO2

Answer 14

bubble through limewater. co2 present = milky

Question 15

test for sulfate ions

Answer 15

• add dilute hydrochloric acid + barium chloride solution
• white ppt forms if sulfate is present