This section covers the complete process of préparation de solution mère en laboratoire through dissolution of solids. The protocol emphasizes precise weighing and proper transfer techniques using tared balance methodology.

Vocabulary:

• Balance tarée: Tared balance
• Coupelle de pesée: Weighing boat
• Spatule: Spatula
• Entonnoir: Funnel

Highlight: The dissolution process requires careful attention to complete solute transfer, including rinsing of all equipment surfaces to ensure quantitative transfer.

Example: The six-step dissolution protocol demonstrates proper laboratory technique:

1. Weighing the solute on a tared balance
2. Adding initial distilled water
3. Transferring solute
4. Rinsing equipment
5. Diluting to 2/3 volume
6. Final volume adjustment

This page details the step-by-step process of diluting solutions using volumetric equipment. The protocole de dilution avec pipette jaugée outlines the precise methodology for achieving accurate dilutions in laboratory settings.

Vocabulary:

• Pipette jaugée: Volumetric pipette
• Solution mère: Mother/stock solution
• Fiole jaugée: Volumetric flask
• Trait de jauge: Calibration mark

Definition: Dilution is the process of reducing the concentration of a solution by adding more solvent while keeping the amount of solute constant.

Example: The mathematical relationship for dilution is expressed as Cmo × Vo = Cm₁ × V₁, where:

• Cmo: Initial concentration
• Vo: Initial volume
• Cm₁: Final concentration
• V₁: Final volume

Highlight: Always fill the volumetric flask to approximately 2/3 with distilled water before making the final adjustment to the calibration mark to ensure proper mixing.