Answer: K+ and Cl- ions are produced
Explanation: KCl or Potassium Chloride is an ionic compound. This means that it is formed from an ionic bond between two ions. One of these ions has to have a positive charge and the other has to have a negative charge (Cation is positive and Anion is negative). The reason behind this is that since a cation has a positive charge, it is missing an electron. An electron has a -1 charge so an atom has to lose an electron to become a cation. The cation wants an electron so it can become an atom. On the other hand, the anion has an extra electron because of its -1 charge. The anion can give an electron to the cation and both ions will complete their octets.
One way that you could argue against my reasoning is that Cl+ and K- would work because they are a cation and anions. Although that would work in theory, Cl does not form a cation. K also does not form an anion. This is because Cl is a group 17 non-metal. This means it has 7 electrons in its octet so it has a +1 charge. K on the other hand is a group 1 metal meaning it has 1 electron in its octet. Therefore, it has a -1 charge.
This means that K+ and Cl- are the only possible ions that will form KCl. When KCl dissociates in water, it dissociates back into the ions that constitute it.
Hope this helps!
Now figure out what ions NaCl and MgCl2 would produce when dissolved in water.