**Answer:**

Ksp of KClO3 is 7.40

**Explanation:**

Step 1: Data given

Mass of KClO3 = 4.00 grams

Molar mass of KClO3 = 122.5 g/mol

Volume of water = 12 mL = 0.012 L

Temperature = 85 °C

Step 2: The balanced equation

KClO3 →K+ + ClO3-

Step 3: Calculate moles of KClO3

Moles KClO3 = mass KClO3 / molar mass KClO3

Moles KClO3 = 4.00 grams / 122.5 g/mol

Moles KClO3 = 0.03265 moles

Step 4: Calculate concentration

Concentration = moles / volume

[KClO3] = 0.03265 moles / 0.012 L

[KClO3] = 2.72 M

For 1 mKsp of KClO3 is 7.40ol KClO3 we have 1 mol K+ and 1 mol ClO3-

[KClO3] = [K+] = [ClO3-] = 2.72 M

Step 5: Calculate Ksp

Ksp = [K+][ClO3-]

Ksp = 2.72 * 2.72

Ksp = 7.40