1. Theoretically, the accuracy of pallet balance is lower than that of volumetric flask and burette. So you can't use it together. However, it was also introduced in the previous high school textbooks, which should be limited by the laboratory conditions at that time. Generally, it is not clearly stated in the current teaching materials, but in the teaching reference books, it is generally recommended to use "electronic balance" for weighing.

2. The volumetric flask is used to prepare the solution, not to store the solution for a long time, so the answer is no, and a special reagent bottle should be used to store the solution.