During a filtration, if you still have solid in your flask that you need to get onto the filter funnel, you should use the filtrate from your filtration to wash them out.

Question

BlackTom AI · Accepted Answer

Because the filtrate (mother liquor) already contains whatever solute was soluble under the conditions, rinsing remaining solid into the funnel with a small amount of that filtrate minimizes further loss of product by dissolution.

1) Relevant concepts and knowledge points
- Filtration and washing: after recrystallization or precipitation, solids are collected by vacuum or gravity filtration and often rinsed to transfer remaining solids and remove impurities.  
- Solubility equilibrium: a solvent that is already saturated with a solute will dissolve less (or none) of that solute than a fresh solvent.  
- Practical lab technique: using the mother liquor (filtrate) as a rinse reduces loss of product to the wash and conserves solvent.

2) Step-by-step reasoning
- Suppose you have solid product stuck in the filter flask. The filtrate already contains the solvent and any dissolved species at the concentration established during the run.  
- If you rinse those solids with fresh solvent cooler or of different composition, you risk dissolving and carrying more product into the filtrate, lowering yield.  
- Rinsing with a small volume of the collected filtrate does not significantly change the concentration of dissolved product (it’s already present), so little additional product dissolves and the solid is efficiently transferred onto the funnel.

3) Intermediate steps (conceptual)
- Mother liquor concentration ≈ current equilibrium concentration. Adding a small aliquot of that same liquor does not reduce supersaturation, so minimal additional dissolution occurs.  
- Practical step: pour a small amount of filtrate down the flask walls to wash solids into the funnel; repeat if necessary with minimal volumes.

4) Why this answer is correct
- It directly follows from solubility principles and common lab practice: using the filtrate (mother liquor) as the rinse preserves product yield and safely transfers solids to the filter.

5) Why the alternative (use fresh solvent instead) is generally incorrect
- Fresh solvent, especially warm or more solvent, can dissolve more of the product, increasing losses and reducing yield. Fresh solvent is appropriate only when you intentionally want to remove soluble impurities (and you accept loss) or when the filtrate is contaminated and cannot be reused.

6) Conclusion
- Therefore the statement is True: using the filtrate to wash leftover solid into the funnel is the recommended practice to minimize product loss. This matches the provided answer: True.

During a filtration, if you still have solid in your flask that you need to get onto the filter funnel, you should use the filtrate from your filtration to wash them out.True/False

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