A supplier provides "Chemical A, 98%, for synthesis".
Another supplier provides "Chemical A,98%, Lab grade"
Are they equivalent?
Which is better for analytical use?
Thanks.
The truth is, each supplier has their own descriptions, and in those descriptions generally define the standard that they tested against. So without that, you have no idea what the other 2 percent is...is it a solvent, or trace other elements. So the question which is better for analytical use cannot be answered. I have never seen the word "for synthesis" on a label. Your teacher is leading you to compare with lab grade, which is sometimes useful for analytical purposes, but not always (depends on the use). So without a definition from the supplier, it is not possible to know.
Look at these two suppliers:
http://www.reagents.com/products/reagents/grades.html
http://secure.sciencecompany.com/Chemical-Grade-Designations-W53.aspx
To determine whether the two chemicals are equivalent, we need to consider their specifications and intended uses. The key factors to consider are the purity level and the intended application of the chemicals.
Analyzing the specifications first:
1. "Chemical A, 98%, for synthesis": This indicates that the chemical has a purity level of 98%. The term "for synthesis" suggests that it is intended for use in chemical reactions or synthesis processes.
2. "Chemical A, 98%, Lab grade": Like the first supplier's offering, this chemical also has a purity level of 98%. However, the term "Lab grade" does not provide any specific information about the intended use.
Based solely on the specifications, both chemicals have the same purity level of 98%.
Now, considering the intended use:
Given the specific needs for analytical use, it is generally preferable to select chemicals that are specifically labeled for analytical applications. Analytical grade chemicals are typically manufactured with stricter quality control measures to minimize impurities and ensure accuracy in analytical testing.
Since neither of the suppliers explicitly specifies their chemicals as "analytical grade," we cannot definitively determine which one is better for analytical use based on the information provided.
To make an informed decision, it would be advisable to reach out to the suppliers and inquire about whether they offer analytical grade versions of the chemical or to seek recommendations from colleagues, experts, or reputable sources in the field of analytical chemistry.
In conclusion, based on the information provided, neither supplier can be determined to be better for analytical use, but it would be prudent to explore options for chemicals labeled as "analytical grade" from different suppliers.