Any substance which has free ions, which help in conduction, is called electrolyte. In other words, some substance in their solution form has free ions, these ions transfer electricity. This solution is called ionic solution and acts as a electrically conductive medium. Sodium hydroxide is a strong electrolyte. When it is dissolved in water, sodium ions and hydroxide ions are formed. Sodium hydroxide reacts with acids to form salts and water. Moreover, sodium hydroxide is a base and also known as caustic soda.