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.

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.

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.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

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