okay i got 4 questions
1. what is the advantages of a standard solution?
2. Describe the two ways of preparing an aqueous solution?
3. why is it important that you use a clean, dry beaker whe you transfer any solution of known concentration?
4.what is the disadvantages of using a volumetric flask to make up a solution?
A standard solution is just one of known concentration. As concentration affects chemical reactions it is always best to know the concentration of the chemicals you are using. Question 2 is a bit wierd - I'm not sure what is wanted. You can make an aqueous solution by adding water to a solute or a solute to water! If you transferred a known solution into a wet beaker it would dilute the solution a little bit (not usually enough to matter much). If the beaker was not clean, contaminants could be introduced.
The main disadvantage of using a volumetric flask is that a set volume has to be made up (the size of the flask determines what this volume is).