Answer: Choice II only. It is true that NaCl is a strong electrolyte in water.
Step-by-step explanation:
II. True: NaCl is a strong electrolyte in water.
- NaCl is made from hydrochloric acid (HCl) and sodium hydroxide (NaOH). NaOH is a strong electrolyte and HCl is a strong acid that completely dissociates in water. Acids neutralize bases to produce salts (NaCl) and water (H2O). Strong bases are good electrolytes because they completely ionize in water. NaCl is a strong electrolyte as it splits into sodium and chloride ions in an aqueous solution. Ex. Salt water contains sodium chloride dissolved in water. Salts are often strong electrolytes.
I. False: It partially dissociates while dissolving into water.
- A *strong* electrolyte would completely dissociate while dissolving into water, NOT partially. *Weak* electrolytes only dissociate partially. Strong electrolytes exist as ions in an aqueous solution like water (completely dissociate) and the weak electrolytes exist only partly as ions in a solution (just partially dissociates).
III. False: A substance can be both a strong electrolyte and nonelectrolyte in water.
- Nonelectrolytes produce NO ions in solution. A substance cannot be both a strong electrolyte and non electrolyte in water. Nonelectrolytes do not conduct electricity in aqueous solutions. They do not dissociate even partly.