Module 1 (practicals)
No description yet. This curated deck is ready for daily study.
Card preview (17)
2.4 Standard Solution: What is the purpose of producing a standard solution?
To prepare a solution of known, accurate concentration
2.4 Standard Solution: Why use a volumetric flask?
It measures one precise volume very accurately.
2.4 Standard Solution: Why must the solid be dry before weighing?
Water increases mass and leads to a lower concentration.
2.4 Standard Solution: Why dissolve the solid in a small amount of solvent first?
To ensure it fully dissolves before making up to the mark.
2.4 Standard Solution: Why rinse the beaker and stirring rod into the volumetric flask?
To transfer all solute and avoid concentration errors.
2.4 Standard Solution: Why add solution dropwise near the calibration line?
To avoid overshooting the meniscus.
2.4 Standard Solution: Why invert the volumetric flask after making up?
To mix the solution thoroughly.
2.4 Standard Solution: Common error: meniscus not at eye level — effect?
Causes a systematic error in concentration.
2.5 Titration: What is the purpose of a titration?
To find the concentration of an unknown solution.
2.5 Titration: What equipment is used to add acid/base precisely?
A burette.
2.5 Titration: Before filling, why rinse the burette with the solution it will contain?
To prevent dilution.
2.5 Titration: Why place a white tile under the flask?
To see the colour change clearly.
2.5 Titration: What are concordant titres?
Titres within ±0.10 cm³ that agree closely.
2.5 Titration: Why swirl the conical flask continuously?
To ensure proper mixing and accurate end point.
2.5 Titration: Why is a rough titration done first?
To find the approximate end point.
2.5 Titration: Why should the burette be read from the bottom of the meniscus?
To avoid parallax error.
2.5 Titration: What makes phenolphthalein turn pink → colourless?
Acid added to an alkaline solution.