Worksheet

Saturated, unsaturated and supersaturated solutions

Grade 10 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

  1. Salt dissolves up to 36 g per 100 g of water at 25 °C. What is the most that dissolves in 250 g of water at 25 °C, Bo?

  2. Baking soda dissolves up to 12.7 g per 100 g of water at 40 °C. What is the most that dissolves in 50 g of water at 40 °C, Esme?

  3. Sugar dissolves up to 200 g per 100 mL of water at 25 °C. What is the most that dissolves in 75 mL of water at 25 °C, Jun?

  4. Baking soda's limit is 8.2 g per 100 g at 10 °C. A slowly cooled, clear solution at 10 °C holds 11.0 g per 100 g. Which is it, Milo?

    • Saturated
    • Unsaturated
    • Supersaturated

  5. A saturated baking soda solution at 60 °C (16.5 g per 100 g) cools to 20 °C (9.6 g). What usually happens, Noah?

    • About 6.9 g per 100 g of water crystallizes out
    • Nothing, since the solid stays dissolved as it cools
    • More baking soda dissolves as the water cools

  6. Why do crystals often form when a hot saturated solution cools, Pia?

    • Most solids dissolve less when cold, so the extra comes out
    • The water itself freezes into crystals
    • Cold water dissolves more, which pushes the old crystals out of it

  7. A saturated salt solution warms from 25 °C to 60 °C. What happens to how much salt it can hold, Ren?

    • It can hold less, so salt crystallizes out of it as it warms up
    • It turns supersaturated as it warms
    • It can hold a little more, so it becomes slightly unsaturated

  8. How is a supersaturated solution usually reached, Tala?

    • By cooling a hot saturated solution gently, with no crystals
    • By leaving undissolved crystals sitting on the bottom
    • By stirring extra solid into a cup of cold water

  9. A clear supersaturated solution fills with crystals when the cup is tapped. Why, Zee?

    • The solution was unsaturated, so it could hold no more solute
    • The tap starts crystals, and the extra solute comes out
    • The tap adds more solute to the cup from the air

  10. After crystals form in a supersaturated solution, what is the liquid left behind, Ari?

    • Still supersaturated, with the same extra solute dissolved
    • Pure water, with no solute left in it
    • Saturated: it holds the most that can dissolve
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Saturated, unsaturated and supersaturated solutions

Answer Key - Grade 10 Science Worksheet

Circle the best answer, or write your answer on the line.

  1. Salt dissolves up to 36 g per 100 g of water at 25 °C. What is the most that dissolves in 250 g of water at 25 °C, Bo?

    90 g

  2. Baking soda dissolves up to 12.7 g per 100 g of water at 40 °C. What is the most that dissolves in 50 g of water at 40 °C, Esme?

    6.35 g

  3. Sugar dissolves up to 200 g per 100 mL of water at 25 °C. What is the most that dissolves in 75 mL of water at 25 °C, Jun?

    150 g

  4. Baking soda's limit is 8.2 g per 100 g at 10 °C. A slowly cooled, clear solution at 10 °C holds 11.0 g per 100 g. Which is it, Milo?

    • Saturated
    • Unsaturated
    • Supersaturated

  5. A saturated baking soda solution at 60 °C (16.5 g per 100 g) cools to 20 °C (9.6 g). What usually happens, Noah?

    • About 6.9 g per 100 g of water crystallizes out
    • Nothing, since the solid stays dissolved as it cools
    • More baking soda dissolves as the water cools

  6. Why do crystals often form when a hot saturated solution cools, Pia?

    • Most solids dissolve less when cold, so the extra comes out
    • The water itself freezes into crystals
    • Cold water dissolves more, which pushes the old crystals out of it

  7. A saturated salt solution warms from 25 °C to 60 °C. What happens to how much salt it can hold, Ren?

    • It can hold less, so salt crystallizes out of it as it warms up
    • It turns supersaturated as it warms
    • It can hold a little more, so it becomes slightly unsaturated

  8. How is a supersaturated solution usually reached, Tala?

    • By cooling a hot saturated solution gently, with no crystals
    • By leaving undissolved crystals sitting on the bottom
    • By stirring extra solid into a cup of cold water

  9. A clear supersaturated solution fills with crystals when the cup is tapped. Why, Zee?

    • The solution was unsaturated, so it could hold no more solute
    • The tap starts crystals, and the extra solute comes out
    • The tap adds more solute to the cup from the air

  10. After crystals form in a supersaturated solution, what is the liquid left behind, Ari?

    • Still supersaturated, with the same extra solute dissolved
    • Pure water, with no solute left in it
    • Saturated: it holds the most that can dissolve