1. The hydroxide ion concentration in a household cleaning solution is 0.299 mmol/L. Calculate the hydronium ion concentration of the cleaning solution. Express the answer in a.b x 10^-cd format.

2. Calculate the hydroxide ion amount concentration in a solution prepared by dissolving 0.37 g of hydrogen chloride in 250 mL of water. Express the answer in a.b x 10^-cd format.

3. Calculate the hydronium ion amount concentration in a saturated solution of calcium hydroxide (limewater) that has a solubility of 6.9 mmol/L. Express the answer in a.b x 10^-cd format.

4. What is the hydronium ion amount concentration in a solution made by dissolving 20.0 g of potassium hydroxide in water to form 500 mL of solution? Express the answer in a.b x 10^-cd format.

5. Calculate the percent ionization of water at SATP. Recall that 1.000 L of water has a mass of 1000 g. Express the answer in a.bc x 10^-d format.