Name Period Date / / Station 1 ACIDS, BASES, AND NEUTRALS Classify each statement as talking about an [A]cid, [B]ase, or [N]eutral. feels slippery CH3OH tastes sour H + donor KOH increases [OH - ] turns cabbage juice red increases [H + ] tastes bitter H2SO3 cabbage juice stays purple NaHCO3 Ammonia, NH3, is a weak base. Cabbage juice would turn with NH3. NH3(aq) would be considered a (strong weak non) electrolyte. In water, NH3 can be described by the equation: NH3(aq) + H2O(l) NH4 + (aq) + OH Indicate one conjugate acid-base pair: and NH3 fits the Arrhenius definition of a base because it. NH3 fits the Bronsted-Lowry definition of a base because it. Draw the solution to the right using + and for ions and for molecules. Indicate the brightness of the light bulb when testing a solution of NH3(aq). Station 2 SOLUBILITY RULES Circle the Insoluble Ionic Solids and then list the strong acids and strong bases from memory. MgF 2 CuSO 4 NH 4 Cl Fe(OH) 3 CsF AgCl CdS CuF 2 PbSO 4 Ba(OH) 2 Na 2 SO 4 NH 4 OH Sr(NO 3 ) 2 Hg 2 I 2 Na 2 CrO 4 BaCO 3 PbBr 2 CaC 2 O 4 HC 2 H 3 O 2 MgO Strong Acids Strong Bases
Station 3 SOLUBILITY Is this well-stirred mixture best described as saturated or unsaturated? Justify your answer. Consider a solution of NaCl(aq). Draw four water molecules surrounding each Na + and Cl ion below. Which of the following solutes dissolve well in the polar solvent, H2O? (check all that apply) soluble ionic solids insoluble ionic solids strong acids strong bases weak acids weak bases nonpolar solutes A test tube has a layer of polar H2O floating on a layer of nonpolar CCl4 (carbon tetrachloride). Na + Cl CH3OH (polar), C6H6 (nonpolar benzene), AgCl, KCl, and I2 are added to the tube. Which solutes will dissolve in the CCl4 layer? Which solute does not go into either layer? The solubility of NH4Cl(s) at 70 C is g/100 g H2O. How much NH4Cl(s) will dissolve in 40.0 g of H2O? Station 4 SOLUBILITY CURVES If 40.0 grams of a saturated NH4Cl solution is cooled from 70 C to 50 C, how many grams of solute should precipitate? 15.0 g NH4Cl dissolved in 40.0 g of H2O at 50 C would be described as a (unsaturated saturated supersaturated) solution.
Fill in this chart: Station 5 ph CALCULATIONS [H + ] [OH - ] ph poh Acidic/Basic 1.0 10-4 M 3.3 10-2 M 2.0 10-3 M 1.0 10-9 M 5.0 1.8 2.5 4.0 Solve the following problems: Station 6 MOLARITY CALCULATIONS A 2.00 mole sample of NaOH is dissolved in enough water to make 500. ml of solution. What is the concentration of the solution? 60.0 grams of NaOH (MM = 40.00 g mol -1 ) is dissolved in enough water to make 0.750 L of solution. What is the concentration of the solution? A 250. ml sample of a 0.125 M solution of NaOH contains grams of NaOH.
Station 7 MORE MOLARITY PROBLEMS Rank these three solutions from most dilute to most concentrated: X: 10. g solute in a 300. ml solution Y: 20. g solute in a 600. ml solution Z: 20. g solute in a 300. ml solution < < You need to prepare 2.00 L of 3.00 M HCl. What volume of stock (12.1 M HCl) do you need? Consider a 0.200 M solution of aluminum sulfate, Al2(SO4)3. [Al 3+ ] = [SO4 2 ] = HF is a weak acid. Finish the dissociation equation for HF. HF(aq) + H2O(l) The Ka for HF is 7.0 x 10-4. Write the equilibrium expression for HF. Station 8 WEAK ACID EQUILIBRIA Use the ICE Box below to calculate the H + concentration in a 1.0 M solution of HF. What is the % dissociation of a 1.0 M HF solution?
Solids dissolve best in (hot cool) water. Station 9 LOOSE ENDS Gases dissolve best in (hot cool) water. Gases dissolve best when the gas pressure above the solvent is (high low). O2(g) would dissolve in water best: (A) 20C and 2 atm pressure (B) 50 C and 5 atm pressure (C) 20 C and 5 atm pressure (D) 50 C and 2 atm pressure Rate these weak acids from weakest to strongest. HNO2 Ka = 4.0 10 4 HC2H3O2 Ka = 1.8 10 5 HOCl Ka = 3.5 10 8 HCN Ka = 6.2 10 10 < < < Solids dissolve best in (hot cool) water. Station 9 LOOSE ENDS Gases dissolve best in (hot cool) water. Gases dissolve best when the gas pressure above the solvent is (high low). O2(g) would dissolve in water best: (A) 20 C and 2 atm pressure (B) 50 C and 5 atm pressure (C) 20 C and 5 atm pressure (D) 50 C and 2 atm pressure Rate these weak acids from weakest to strongest. HNO2 Ka = 4.0 10 4 HC2H3O2 Ka = 1.8 10 5 HOCl Ka = 3.5 10 8 HCN Ka = 6.2 10 10 < < <