Question

Indicate which techniques are appropriate for preparing a dilute solution from a solid.

ACTION ANSWER
When reading the meniscus of a volumetric flask, your eye should be level with the etched line.
The solid should be weighed into a clean, dry beaker. If too much solid is added, the spatula should be used to remove some solid. The removed solid should be considered waste.
If the volumetric flask is over-filled with solvent above the etched line, the solution should be discarded as it is now inaccurate.
Once the solid is dissolved, fill the volumetric flask with solvent until the top of the meniscus is touching the etched line. Preparation is now complete
The solid should be weighed in a beaker and poured into the volumetric flask using a paper funnel.
The solid remaining in the beaker should be rinsed into the waste.
Once solid is dissolved, fill the volumetric flask with solvent until the bottom of the meniscus is touching the etched line. Then mix the solution. Preparation of the solution is now complete.
The solid should be weighed into a clean, dry beaker. If too much solid is added, the spatula should be used to remove some solid and return it to the reagent jar.

Answer 1

When reading the meniscus of a volumetric flask, your eye should be level with the etched line.

If the volumetric flask is over-filled with solvent above the etched line, the solution should be discarded as it is now inaccurate.

Once solid is dissolved, fill the volumetric flask with solvent until the bottom of the meniscus is touching the etched line. Then mix the solution. Preparation of the solution is now complete.

Step-by-step explanation:

When preparing a solution of a solid, the solid must be accurately weighed. After the solid is weighed, it is now carefully transferred to the volumetric flask.

The person preparing the solution must ensure that his/her eyes is at the same level as the flask. In event of adding water above the etched line. The solution must be discarded because it has exceeded the required concentration.

Once the solid has been transferred to the flask, water is added until the bottom of the meniscus is touching the etched line. The solution is now mixed and preparation of the solution is now complete.