6 – Preparing Sodium Carbonate (LC 2027) (Leaving Cert Chemistry): Flashcards
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Practise the cards
14 cards from this deck
Standard solution
Standard solution
Solution with precisely known concentration
Primary standard
Primary standard
Pure, stable substance used to make standard solutions
4 properties of primary standard
4 properties of primary standard
High purity, stable, known formula, non-hygroscopic
Non-hygroscopic means
Non-hygroscopic means
Doesn't absorb moisture from air
Anhydrous classification
Anhydrous classification
Primary standard
Why deionised water in standard solution prep?
Why deionised water in standard solution prep?
Tap water ions affect concentration
Quantitative transfer
Quantitative transfer
Ensuring all material reaches final solution
Why wash beaker, rod & funnel?
Why wash beaker, rod & funnel?
To transfer all sodium carbonate to flask
Correct meniscus reading method
Correct meniscus reading method
Bottom of curve at eye level
Times to invert flask after dilution
Times to invert flask after dilution
About 20 times
Concentration formula (mol/L)
Concentration formula (mol/L)
where C=conc, n=moles, V=volume(L)
Molecular mass of (g/mol)
Molecular mass of (g/mol)
106
Balance precision required (g)
Balance precision required (g)
0.001
Final volume adjustment tool
Final volume adjustment tool
Dropper
