Chemistry Y10 - Solubility Flashcards
What do solubility curves show?
Solubility curves show the amount of solute which dissolves to form a saturated solution at any given temperature
Solutes whose curves curve upwards are typically solids typically as they ……………..
Become more soluble with increasing temperature
Solutes whose curve curves downwards are typically gases as they become …. …… .. ……. ………
more soluble as temperature increases
Practical in one note solubility curve for ammonium chloride
Learn
PRACTICAL: RECRYSTALLISATION OF BENZOIC ACID
- Weigh an empty 150cm^3 beaker on the 2dp balance
- Add a heaped teaspoonful of the IMPURE benzoic acid and reweigh, note down
- Add around 50cm^3 of water to the beaker and stir while boiling it on a tripod
- If solid does not dissolve add more water
- Allow solution to cool
Indicators- name all of the indicators learnt colours in acidic solutions
Red litmus- stays red
Blue litmus- Turns red
Phenolphthalein- Stays colourless
Methyl orange- turns red
Indicators name the colour they turn when in alkali solutions
Red litmus- turns blue
Blue litmus- stays blue
Methyl Orange- Turns yellow
Phenolphthalein- Turns pink
What is an Acid?
An acid is a substance that produces H+ ions when dissolved in water
What is an Alkali
An alkali is a substance that produces OH- ions when dissolved in water
Describe an Acid-Alkali titration
Fill the burette with acid and note the reading
Pipette 25.0 cm^3 of Alkali into the conical flask
Add 3 drops of indicator
Open the burette’s tap, continuously swirling the mixture
Stop when the Indicator changes colour from pink to colourless.
Repeat the titration three times until concordant results are achieved
Common sodium, potassium and ammonium are all soluble or insoluble
Soluble
All nitrates are soluble
True or false?
True
Common chlorides are soluble except those of
Silver and Lead
Common sulphates are soluble except for those of
Barium, calcium and lead
Common Carbonates are INSOLUBLE except for those of
Sodium, potassium and ammonium
