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Worksheet8th GradeLevel 2 · Standard

Free 8th Grade Solutions, Solubility and Concentration Worksheet

Students use the terms solute, solvent, solution, soluble, insoluble and saturated, explain dissolving with the particle model and identify the factors that speed it up. They read a solubility table to see how temperature affects solubility, calculate how much solid crystallizes when a saturated solution cools, and calculate concentration in grams per liter.

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Grade
8th Grade
Subject
Science
Topic
Mixtures & Chemical Reactions
Difficulty
Level 2 · Standard
Estimated time
40 minutes
Curriculum
Texas grade levels (TEKS)
Questions
15
Answers
Included, with working
Format
PDF (A4), print or complete online

Students will practice

  • using the terms solute, solvent, solution and saturated
  • explaining dissolving using the particle model
  • identifying factors that affect the rate of dissolving
  • interpreting solubility data
  • calculating concentration in grams per liter

Curriculum: Texas grade levels (TEKS). We show specific outcome codes only where they have been verified against the official curriculum document.

What's next?

Completed: Solutions, Solubility and Concentration

Ready for more? Move on to 9th Grade Science.

Study guide

How to use this worksheet

  1. Print the PDF or complete it on screen. Write the student's name and date at the top.
  2. Read the instructions for each part together before starting. Encourage working to be shown.
  3. Mark with the answer sheet. Use the model answers and success criteria as a guide rather than a single right answer.
  4. Record the score, celebrate what went well, then follow the "What's next" suggestion.

Common questions

Who is this worksheet for?

8th Grade students (typically ages 13–14) working on mixtures & chemical reactions. It is pitched at level 2 · standard.

Are the answers included?

Yes. The PDF includes a full answer sheet with model answers and success criteria where there is more than one good answer. You can also view the answers online.

How long does it take?

About 40 minutes for 15 questions. Short, regular sessions work best: two or three a week beats one long one.

Do I need to sign up to download?

No. Click Download Free PDF and it opens immediately. It is free for personal, classroom and homeschool use.

What should we do next?

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Success TutoringWorksheets8th Grade · Science · Mixtures & Chemical Reactions

Solutions, Solubility and Concentration

Name

Date

Score /

Solute + solvent = solution. Check units: convert mL to L before calculating g/L.

Part A: Dissolving

A solution forms when a solute dissolves in a solvent. Water is the most common solvent. The solute particles break away from the solid and spread out evenly between the solvent particles.

Dissolving is faster when the solvent is warmer, the mixture is stirred and the solute is in smaller pieces (more surface area).

1.In salt water, the salt is the (answer space) and the water is the solvent.
2.A substance that does not dissolve in a solvent, such as sand in water, is described as (answer space).
3.What is a saturated solution? (answer space)
4.When sugar dissolves in water, the sugar disappears and its mass is lost. ☐ True   ☐ False
5.Which change would not make sugar dissolve faster in water?
  1. AStirring the mixture
  2. BUsing warmer water
  3. CUsing sugar cubes instead of fine sugar
  4. DCrushing the sugar into smaller pieces
6.Use the particle model to explain why stirring speeds up dissolving. (answer space)

Part B: Solubility and temperature

Solubility is the greatest mass of a solute that dissolves in 100 g of water at a given temperature.

Solubility (g per 100 g of water) — Potassium nitrate: 20 °C 32 g, 40 °C 64 g, 60 °C 110 g. Sodium chloride: 20 °C 36 g, 40 °C 37 g, 60 °C 37 g.

7.Describe how temperature affects the solubility of potassium nitrate, and compare it with sodium chloride. (answer space)
8.At 40 °C, 50 g of potassium nitrate is dissolved in 100 g of water. Is the solution saturated? If not, how much more could dissolve?
9.A saturated solution of potassium nitrate in 100 g of water is cooled from 60 °C to 20 °C. What mass of crystals forms?
10.What is the greatest mass of potassium nitrate that will dissolve in 50 g of water at 20 °C?

Part C: Concentration

Concentration tells you how much solute is dissolved in a certain volume of solution. Concentration (g/L) = mass of solute (g) ÷ volume of solution (L). Remember 1000 mL = 1 L.

11.20 g of sugar is dissolved to make 500 mL of solution. What is the concentration in g/L?
12.15 g of salt is dissolved to make 250 mL of solution. What is the concentration in g/L?
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Preview — the PDF contains the full resource and answer sheet.

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About this resource

Created by
Success Tutoring Science Team
Last reviewed
1 October 2026
How it was made
Written by our team

Free to print and share for personal, classroom and homeschool use. Please don't resell. Spotted an error? Let us know.