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05 HW - pH and pOH - Name Date WKST#19 pH and pOH...

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Name: _________________________________________ Date: ___________ WKST #19 pH and pOH Calculations Period: _________ 1. Write the chemical equilibrium equation that exists between water and its ions. 2. Write the equilibrium expression for pure water (K w ). 3. If the water sample is 100% pure, what are the concentrations of the hydronium and hydroxide ions? 4. When a base is added to water, the H 3 O + concentration _________ and the OH - concentration _________. When an acid is added to water, the H 3 O + concentration _________ and the OH - concentration __________. 5. For each acidic or basic solution below (assume complete dissociation): Write the dissociation equation Find the pH Find the pOH Remember to show your work! a. 0.0567 M HCl b. 3.35 x 10 -5 M H 2 SO 4 c. 0.012 M Ca(OH) 2 d. 9.56 x 10 -9 M HI
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