AC Chemistry Review Unit 12 - (23-24)

Solutions

100

I am stirring sugar into a solution for the hummingbirds.  What are three ways I could incorporate the sugar into the water faster?

Stirring, heating it up, smaller sugar crystals

200

What would happen if I tried to add more solute to a saturated solution?

Some would precipitate out of the solution

300

Remember back to when we made crystals in class.  Explain why the crystals formed and why we had to heat up the solution.

When the water cooled, its saturation point dropped, so less salt could dissolve in cold water

400

Explain why we keep opened sodas in the fridge and not on the counter

Because gas has a higher solubility in colder water

Solutes

100

What is a hydrate?

chemical that forms a crystal with water

200

1.2 grams of hydrogen chloride is dissolved in 25 mL of solution, what is the molarity?

1.3 M

300

What is the molarity if I have 1.2 moles of calcium carbonate in a 1.22 liter solution?

0.98 M

400

98 grams of solidum hydroxide are dissolved in 2.2 liters of solution, what is the molarity?

1.1 M

Dilutions

100

If water is added to 175 mL of a 0.45 M KOH solution until the volume is 250 mL, what will the new molarity be?

0.32 M

200

If 550 mL of a 3.50 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 275 mL, what will the new molarity be?

7.0 M

300

How would you prepare 2.00 l of 0.100 M K₂CrO₄ from 1.75 M K₂CrO₄ stock solution?

Take 0.11 L out of the stock and put it in a new flask, fill the flask up to the new line.

400

How many moles of NaOH are contained in 65.0 mL of a 2.20 M solution in water?

0.143 moles

Moles

100

What are the spectator ions in the reaction between KCl and AgNO₃ in an aqueous solution

K + and NO₃-

200

What is the chemical equation for the double displacement between Zn(NO₃)₂ and (NH₄)₂S?

Zn(s) + 2NH₄NO₃

300

Copper(II) chloride and lead(II) nitrate react in a double displacement reaction.  If 13.45 g of copper (II) chloride react, what is the maximum amount of precipitate that could be formed?

27.82 g PbCl₂

400

how many moles Na₂SO₄ is dissolved in water to make 450 mL of a 0.25 M solution?

0.113 moles

Net Ionic equations

100

What is the net ionic equation between Nickle (II) nitrate and sodium hydroxide?

Ni²⁺ + 2OH^- -> Ni(OH)₂

200

What is the net ionic equation between potassium fluoride and magnesium nitrate?

2F^- + Mg²⁺ -> MgF₂

300

What steps should you take to make 2 liters of 5M solution of NaCl?

Include the amount of lab equipment necessary.

10 mole of sodium chloride 58.44

584.4 g

add some water to a volumetric flask, add salt, mix, then add DI water to the fill line.  

400

You have a 5 M stock solution of NaCl.  You want to make 750 ml of a 1 M solution.  What steps should you take to make that solution?

take out 150 ml of the 5 M solution and then add 600 ml of water.