Why does the amount of salt and kosher that dissolved so similar?

It sounds like you're asking about why table salt (NaCl) and kosher salt (also mostly NaCl) dissolve similarly. Here's why:

* Similar Chemical Composition: Both table salt and kosher salt are primarily sodium chloride (NaCl). The difference lies in their processing and grain size, not their chemical makeup.

* Ionic Bonds: Sodium chloride forms strong ionic bonds between the positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-). When these bonds break in water, the ions become surrounded by water molecules (hydration) and can move freely, leading to dissolution.

* Solubility: The solubility of a substance is determined by the strength of its bonds and the interactions with the solvent. Since both salts have the same chemical composition, their solubility in water is very similar.

Slight Differences:

While the solubility is practically identical, there might be slight variations due to:

* Grain size: Kosher salt typically has larger crystals, which might dissolve a bit slower, but ultimately the same amount will dissolve.

* Impurities: Although both are primarily NaCl, trace impurities could slightly affect solubility.

In summary: Table salt and kosher salt have similar solubility in water because their chemical composition is essentially the same. Any slight variations in dissolution rate are usually due to differences in grain size or minor impurities.