Preparing soluble salts acid and alkali

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/5

flashcard set

Earn XP

Description and Tags

9th

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

6 Terms

1
New cards

Apparatus

  • Burette, retort stand and clamp

  • Pipette (25cm3) and safety pipette filler

  • Conical flask

  • Phenolphthalein indicator

  • Hydrochloric acid

  • Sodium hydroxide solution

  • Decolourising charcoal

  • Evaporating basin

  • Filter funnel and filter paper

  • Bunsen, tripod and gauze

2
New cards

Method

  1. Fill burette with hydrochloric acid

  2. With pipette filler, place 25cm3 sodium hydroxide into conical flask

  3. Add 3 drops phenolphthalein indicator to conical flask

  4. Add hydrochloric acid from burette, swirling gently until colour changes

  5. Record volume of hydrochloric acid added

  6. Repeat without indicator, adding recorded volume or use charcoal to remove indicator

  7. Pour solution from conical flask into evaporating basin

  8. Heat filtrate on tripod and gauze until volume is half of original

  9. Leave basin aside to allow solution to cool and crystalise

  10. Filter off crystals (if necessary)

  11. Dry between two sheets of filter paper or desiccator/ low temp oven

<ol><li><p>Fill burette with hydrochloric acid</p></li><li><p>With pipette filler, place 25cm<sup>3</sup> sodium hydroxide into conical flask</p></li><li><p>Add 3 drops phenolphthalein indicator to conical flask</p></li><li><p>Add hydrochloric acid from burette, swirling gently until colour changes</p></li><li><p>Record volume of hydrochloric acid added</p></li><li><p>Repeat without indicator, adding recorded volume or use charcoal to remove indicator</p></li><li><p>Pour solution from conical flask into evaporating basin</p></li><li><p>Heat filtrate on tripod and gauze until volume is half of original</p></li><li><p>Leave basin aside to allow solution to cool and crystalise</p></li><li><p>Filter off crystals (if necessary)</p></li><li><p>Dry between two sheets of filter paper or desiccator/ low temp oven</p></li></ol><p></p>
3
New cards

Observations

  • colourless solutions

  • indicator changes from pink to colourless when neutralised

  • colourless filtrate when using charcoal

  • white crystals

4
New cards

Equation

hydrochloric acid + sodium hydroxide → sodium chloride + water

5
New cards

Error

incomplete neutralisation, solution wont be pure

6
New cards

Safety

  • safety goggles to protect eyes from splashes

  • handle in well ventilated area/ fume cupboard

  • avoid skin contact with corrosive sulfuric acid using gloves