Solutions Part 2 Review

Solutions Part 2 Review

Solubility Rules

• Covalent compounds are not soluble and cannot create electrolytes!

• Soluble compounds form electrolytes.

• Insoluble compounds form precipitates

Multiple Choice

Which of the following is most likely to create an electrolyte?

• H₂O

• NaCl

• NH₃

• PCl₅

Multiple Choice

KOH

• Soluble 
• Insoluble

Multiple Choice

AgI₂

• Soluble

• Insoluble

Multiple Choice

ZnOH

• Electrolyte

• Precipitate

Multiple Choice

KBr

• Electrolyte

• Precipitate

Molarity

• Molarity (M) = Concentration

• The higher the concentration, the more solute there is

•  $M\ =\ \frac{moles}{Liters}$  

• MAKE SURE YOU INSERT LITERS

Multiple Choice

Which sweet tea would you expect to taste the sweetest?

• 1M

• 3M

• 3.1M

• 2.5M

Multiple Choice

What is the molarity of a 0.5L sample of a solution that contains 1.5 moles of sodium hydroxide (NaOH)

• 0.8 M

• 1.5M

• 3.0M

• 6.0M

Multiple Choice

How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?

• 1074 mol

• 0.069 mol

• 1.07 mol

• 62.7 mol

Multiple Choice

How many liters would you need to make a 1 M solution if you have 6 mol of Sodium Hydroxide?

• 2

• 3

• 4

• 6

Dilutions  $M_1V_1\ =\ M_2V_2$  

• Dilutions are performed when you are trying to make a solution less concentrated.

• This means M2 will always be less than M1

• This means that V2 will always be more than V1

What volume of a 2.0 M stock solution of NaCl would you need to use to make 2500 mL of a 0.5 M solution?

Multiple Choice

If I have 340.0 mL of a 0.500 M NaBr solution, what will the concentration be if I add 560.0 mL more water to it? (Remember to use the total new volume)

• .188 M

• 3.78 M

• .389 M

• 1.76 M

Multiple Choice

If I dilute 250 mL of 0.10 M lithium acetate solution to a volume of 750 mL, what will the concentration of this solution be?

• 2 M

• 0.02 M

• 0.033 M

• 0.08 M

Multiple Choice

What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO₃ to a volume of 250.0 mL?

• 15.9 M

• 0.636 M

• 0.642 M

• 1.59 M

From Part 1....Rate of Dissolution

• Three things that speed up dissolving

• Stirring

• Heat

• Surface Area

Multiple Choice

What combination would dissolve a solid solute the fastest?

• high temperature, no stirring

• no heat, no stirring

• sugar cube, no heat

• high temperature, stirring

Multiple Choice

Which will dissolve faster? Crushed table salt or a cube of table salt. Assume they have an equal mass.

• crushed table salt

• crystal of table salt

Multiple Choice

Which of the following statements is true about how using smaller salt crystals would affect the rate of making a salt solution in water?

• Smaller crystals increase the surface area and slow down dissolving.

• Smaller crystals decrease the surface area and speed up dissolving.

• Smaller crystals increase the surface area and speed up dissolving.

• Smaller crystals decrease the surface area and slow down dissolving.