what type of substance is used for preparing standard solution?
To prepare standard solution, the ideal substance should be:
i. The substance should be unreactive and unaffected by atmosphere. Eg. Solid NaOH is hygroscopic i.e. it absorbs moisture from the atmosphere. Thus, it is not an ideal compound to make a standard solution.
ii. It's pure form should be available.
iii. It should easily dissolve in water as we prepare standard solutions in water.
iv. The solution on heating should not be spoiled by heat