Chemistry
The preparation of the salt (sodium Chloride
(buffer) 1. measure 25cms of sodium hydroxide
Neutral
weak
Mak
Strong
acid Strongare
PH = 1 PH =
4 (Buffers PH = 13 (liquid) .
pale light light
Bromothymol yellow yellow green blue blue
2 .
Add drops of methyl orange indicator
Blue
Methyl orange Red Red orange orange orange
3 . Fill burette with hydrochloric acid
Phenolphthalein colourless colourless colourless
Pale
pink
Pale
pink
and then open tap .
Pale Pink pale
Blue litrus pale pink purple
dark
4 Scale is 0 on top and 50 bottom
purple purple
.
Pale Pale
Pale pink Pale pink Perple
Red Litmus purple purple .
5 Add acid from burette in small
portions. till
Continue yellow/orange colour
Making a soluble salt from an insoluble base disperses
.
6 Stop when you reach endpoint of titration
copper
copper oxide
+
+ sulfuric acid - >
sulfate water (only orange colour
CuO() +
H2SO4(aq) >
-
CuSOp(aq) +
H20()
To
get a pure salt
1. Add insoluble copper oxide to Sulfuric acid and Stir . Warm
I don't boil (experiment) with
-
gently Repeat 3 times
2
. Solution turns blue as the reaction occurs. indicator
find added
-
.
3 Filter the solution of acid
average amount
25cm3 of
-
solution in basin in Conical
4
. Gently heat the
evaporating alkali flask +
add average amount of acid
Making an insoluble salt-precipitation -Gently heat the solution in evaporation
basin
I dissolve any solids to make a
solution)
-
Remove of Liquid
leave
-
in warm place to crystalise
1 .
Mix the Liquids together -
a solid should appear
.
2 filter the residue with distilled water
3
. Leave in warm
dry place for water to evaporate
↑
The preparation of the salt (sodium Chloride
(buffer) 1. measure 25cms of sodium hydroxide
Neutral
weak
Mak
Strong
acid Strongare
PH = 1 PH =
4 (Buffers PH = 13 (liquid) .
pale light light
Bromothymol yellow yellow green blue blue
2 .
Add drops of methyl orange indicator
Blue
Methyl orange Red Red orange orange orange
3 . Fill burette with hydrochloric acid
Phenolphthalein colourless colourless colourless
Pale
pink
Pale
pink
and then open tap .
Pale Pink pale
Blue litrus pale pink purple
dark
4 Scale is 0 on top and 50 bottom
purple purple
.
Pale Pale
Pale pink Pale pink Perple
Red Litmus purple purple .
5 Add acid from burette in small
portions. till
Continue yellow/orange colour
Making a soluble salt from an insoluble base disperses
.
6 Stop when you reach endpoint of titration
copper
copper oxide
+
+ sulfuric acid - >
sulfate water (only orange colour
CuO() +
H2SO4(aq) >
-
CuSOp(aq) +
H20()
To
get a pure salt
1. Add insoluble copper oxide to Sulfuric acid and Stir . Warm
I don't boil (experiment) with
-
gently Repeat 3 times
2
. Solution turns blue as the reaction occurs. indicator
find added
-
.
3 Filter the solution of acid
average amount
25cm3 of
-
solution in basin in Conical
4
. Gently heat the
evaporating alkali flask +
add average amount of acid
Making an insoluble salt-precipitation -Gently heat the solution in evaporation
basin
I dissolve any solids to make a
solution)
-
Remove of Liquid
leave
-
in warm place to crystalise
1 .
Mix the Liquids together -
a solid should appear
.
2 filter the residue with distilled water
3
. Leave in warm
dry place for water to evaporate
↑
