Unit 4- Chem Reactions in Solution

Question 1

Solvents

Answer 1

compound that has the same physical state as the solution- frequently a liquid

Question 2

solute

Answer 2

substance being dissolved

Question 3

aqueous solution

Answer 3

water is solvent

Question 4

strong electrolyte

Answer 4

compound that sep completely into ions in water

Question 5

weak electrolyte

Answer 5

molec that only partially ionizes when dissolved in water

Question 6

ionization

Answer 6

the sep of a molec comp into indiv cations and anions when dissolved in water

Question 7

precipitation reactions

Answer 7

involve the formation of an insoluble (solid) product(s) from the reaction of soluble reactants

Question 8

complete ionic equation

Answer 8

shows all strong electrolytes as ions in solution

Question 9

net ionic equation

Answer 9

shows only those species in the solution that actually undergo a chem change

Question 10

spectator ions

Answer 10

do not participate in the chem reaction

Question 11

concentration

Answer 11

the quantity of SOLUTE per given quantity of solution or solvent

Question 12

molarity

Answer 12

of moles of solute in 1 liter of solution
M = moles of solute / liters of solution

Question 13

molarity of ions

Answer 13

mol ions / L solution
* formula of solute must be known

Question 14

dilution problems

Answer 14

moles of solute in the dilution solution = moles of solute delivered from the concentrated solution
molarity(conc) x volume(conc) = molarity(dil) x volume(dil)

Question 15

titrations

Answer 15

the volume of a solution of known concentration is used to calc the concentration of an unknown solution
- the volume of the unknown solution and the reaction stoichiometry must be known

Question 16

equivalence point

Answer 16

the point (volume) in a titration where the stoichiometrically equivalent amounts of the 2 reactants have been added

Question 17

indicator

Answer 17

a compound that changes color as a solution changed between acidic and basic
- changes color at the end point- the end point volume should be very close to the equivalence volume

Question 18

phenolphthakin indicator

Answer 18

light pink = acidic solution with indicator added
medium pink = endpoint
dark pink = excess base added