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Warm Up #7

Warm Up #7. You are INITIALLY given 98.5 grams of Magnesium Hydroxide , Mg (OH) 2 , in a 500 mL solution with water . Kb = 8.9x10 -3 1. Is magnesium hydroxide a weak or strong base? 2. What is the concentration of Mg (OH) 2 ? 3. What is the [OH - ]? [YOU NEED ICE TABLE]

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Warm Up #7

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  1. Warm Up #7 • You are INITIALLY given 98.5 grams of Magnesium Hydroxide, Mg(OH)2, in a 500 mL solution with water. Kb = 8.9x10-3 • 1. Is magnesium hydroxide a weak or strong base? • 2. What is the concentration of Mg(OH)2? • 3. What is the [OH-]? [YOU NEED ICE TABLE] • 4. What is the pH of this substance?

  2. Warm Up #7 10 grams NH3, a weak base, reacts with water to make a 5 L solution at equilibrium. The Kb of NH3 is 1.8x10-5 • Calculate [NH3]…M = mol/L • Show the reaction between NH3 and water, and set up a Kb equation. • Solve for the [OH-]. With this, solve for the pH of your base.

  3. Chapter 19.5 Hydrolysis of a Salt

  4. Hydrolysis…what? • Hydrolysis – adding water • When adding water to a salt you get… • One acid • One base • Ex. NaCl + HOH  NaOH + HCl • NaOH = base, HCl = acid • DOUBLE REPLACEMENT

  5. Strong Acids and Bases • Strong Acids: HCl, HBr, HI, HNO3, HClO3, H2SO4 • Strong Bases: Any Alkali/alkaline metal with OH (except Mg)

  6. pH of the Salts • Strong acid and Strong base • NEUTRAL pH • Strong acid and Weak base • ACIDIC pH • Weak acid and Strong base • BASIC pH • Weak acid and Weak base • UNKNOWN pH

  7. Warm Up #9 You add water to Al(NO3)3: • Show this chemical reaction, and balance the equation. • On the products side, label the acid and the base (including their names). Also, include the strength of each (weak/strong). • What will the pH of this salt be (acidic/basic)? How do you know?

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