Unit 3

Question 1

Electrolytes

Answer 1

Substances that when dissolved in water allow an electric current
(Salts, Bases, Acids)

Question 2

Electrical Conductivity in Electrolytic Solutions

Answer 2

“Current of ions”
Occurs in an ionic solution if there are objects in the solution that have opposite charges (electrodes)

Question 3

Acid (Litmus Paper, Taste & Touch)

Answer 3

Litmus paper red & sour

Question 4

Base (Litmus Paper, Taste & Touch)

Answer 4

Litmus paper blue, bitter & slippery

Question 5

Salt (Litmus Paper, Taste & Touch)

Answer 5

No effect on litmus paper & salty

Question 6

pH Scale

Answer 6

Acid (0-6) - More acidic with lower numbers
Neutral (7)
Base (8-14) - More basic with higher numbers

Every difference of 1 unit on the pH scales represents a factor of 10

Question 7

pH indicators and turning point

Answer 7

Indicators are dyes that can change colour when added to solutions of certain pH levels
Can mix indicators (colours will mix together)

Turning point is when the colour changes (can be a range)

Question 8

Formula for ppm

Answer 8

C(ppm) = m(mg) / v(L)
Or
C(ppm) = m(mg) / m(kg)

Question 9

Formulas for Percentage Concentration

Answer 9

C (%) = m(g) / v(ml) X 100

C (%) = v(ml) / v(ml) X 100

C (%) = m(g) / m(g) X 100