electrical conductivity of a solution

Question 1

what’s an electrolyte

Answer 1

a substance that when dissolved in water allowed an electric current to flow through the solution

Question 2

whats electrolytic dissociation

Answer 2

the separation of dissolved compound into 2 ions of opposite charges

Question 3

what does NaCl dissociate to in water (PS all electrolytic dissociation happens in water)

Answer 3

Na^+1 (aq) + Cl ^-1 (aq)

Question 4

whats the electrical conductivity of a solution

Answer 4

a measure of it’s ability to allow an electric current to flow through it due to the ion carrying the charge

Question 5

what are the 3 types of electrolytes

Answer 5

• salts
• bases
• acids

Question 6

what are the 3 steps to the electrical conductivity process

Answer 6

1. electrolyte dissociate in water into + or - ions
2. those ions migrate towards the electrode of the opposite charge
3. electricity is carried through the liquid until the ions run out

Question 7

what does the strength of an electrolyte depend on

Answer 7

it’s degree of dissociation

Question 8

what does it mean when an electrolyte dissociate 100% into an ion

Answer 8

it carries electricity easily

Question 9

what does it mean when an electrolyte dissociâtes into few ions

Answer 9

carries electricity weakly

Question 10

what does it mean when an electrolyte doesn’t dissociate

Answer 10

it doesn’t carry electricity

Question 11

what’s an acid

Answer 11

a substance that gives H+ ions in water

Question 12

what are 3 ways to recognize an acids

Answer 12

• chemical formula usually starts with H
• pH [0, 7[ (litmus paper turns red)
• tastes sour, react with metals

Question 13

what’s the exception for acids

Answer 13

acetic acid: CH3COOH

Question 14

what’s a base

Answer 14

a substance that gives OH-1 ions in water

Question 15

what are 3 ways to recognize bases

Answer 15

• chemical formula usually ends with OH (generally combination of a metals and OH)
  -pH ]7, 14] (turns litmus paper blue)
• bitter, slippery to touch

Question 16

what’s the exception for bases

Answer 16

ammonia: NH3(s)

Question 17

what’s a salt

Answer 17

a substance produced from the bonding of a metallic ions and a nonmetallic ion

Question 18

what are 2 ways to identify salts

Answer 18

-they don’t start with H or end with OH (always combination of metal & nonmetal)
-they can be acidic, basic or neutral

Question 19

what happens when an acid and a base dissociate together

Answer 19

they neutralize (product is neutral)

Question 20

what does it mean on the pH scale if the pH level is lower than 7

Answer 20

the solution is acidic

Question 21

what does it mean on the pH scale when the pH is 7

Answer 21

the solution is neutral

Question 22

what does it mean on the pH scale when the pH is greater than 7

Answer 22

the solution is a base

Question 23

what’s another word for a base

Answer 23

alkali (basic=alkaline)

Question 24

what’s an indicator used for

Answer 24

to detect the presence of an acid or a base