Slightly soluble means the quality where only a small amount of a substance dissolves. Usually, this amount cannot be seen by the human eye and is interchangeable with insoluble. A weak electrolyte is a substance which partially ionizes in water. Furthermore, this substance creates a weak current. However, it may be very soluble or not soluble at all.
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Slightly soluble means substances that can partially dissolve in water. However, a weak electrolyte describes substances that partially ionize or produce ions in water. Weak electrolytes may be soluble or slightly soluble.