If yes, what is the difference? Solution preparation method- wt/vol and wt(m)/wt (m). Any difference?
I think it will be differ significantly. Because, Solvent weight depends on density, i.e. Water (1 g/cm3) and glycerin (1.261 g/cm3) density is not equal.
For example, If you take water in 100 ml beaker and glycerin in 100 ml another beaker (zero beaker weight); the weight of total solvent will differ significantly. The weight may be 100 g of water and 126.1 g of glycerin (Assumed from density of them).
For W/V, If you want to prepare 9.8 M Urea, you need 58.87 g Urea in a beaker and top up it with water/other solvent until 100 ml. But if you compare the 9.8 M urea (different solvent), you can see the differences. However, Finally, I think if the solvent is water for all chemicals, there is no differences.
W/W will be always ideal concept for analysis if we can do so.... but the volumetrics available in Class A classified have very much practical accuracy and can expect reproducible and reliable over time when we wish or any another equally qualified to construct same experiment
Hello there,
Definitely diffferent, since the density of the entities are different. With high quality deionised water, the density is 1. That is why when one prepares any solution one specifies whether it is mass/volume or volume/volume. For instance, if you want to prepare a solution of 1% NaCl in water, then you weigh 1g of NaCl and make it to 100 mL with deionised water - 1% mass/volume. On the other had if you want to make a solution of a fluid (1 mL) in 99 mL of a solvent (not necessarily water), then it will also be 1% solution but volume/volume. The density of these 2 solutions will differ depending on the density of the solvent. I hope this helps
- Badges
- Science method
- Similar topics
- Chemistry
- General Biochemistry
- Biochemical Techniques
- Analytical Chemistry