Previously, some Sodium Chloride salt that was put into water could dissolve into the water. Why is that?
Category
📚
LearningTranscript
00:00Previously, some sodium chloride salt that was put into water could dissolve into the water.
00:10Why is that?
00:12Let's look at it on a molecular scale.
00:19Molecules in solids such as salt are arranged regularly in a certain pattern.
00:26When salt is put into water, these molecules ionize into sodium ions and chloride ions.
00:33The size of the sodium ions and chloride ions is almost the same as the size of water molecules,
00:41so that the Na plus and Cl minus ions can be evenly distributed between the water molecules.
00:48The separation distance between the Na plus ions and Cl minus ions varies and is relatively far.
00:55That is why the solid form of salt in water is no longer visible.
01:03Now, assume that 375 grams of salt can be represented by 6 molecules of sodium chloride,
01:10and the volume of water is 1 liter.
01:16If the mass of dissolved salt is less than 375 grams, all salt molecules will be ionized.
01:34If the mass of regular salt is more than 375 grams,
01:38then some salt molecules will remain in the form of sodium chloride molecules.
01:43Because water can only dissolve 6 molecules of sodium chloride.
01:51Well, the salt molecules that are still in molecular form are what look like a sedimentary mass.
02:03So, from here we know that, the substances dissolved in water are in the form of their ions.
02:10While the substances that settle at the bottom of the tube are substances that are still in molecular form.
02:19Hopefully useful.
02:21And, don't forget to follow this channel.