What does a solubility curve show?

It shows solubility (usually grams of solute per 100 g of water) versus temperature for one or more salts. Use the chart to read how much dissolves at a given temperature and to classify mixtures as unsaturated, saturated, or supersaturated.

How do you know if a solution is saturated from the graph?

Plot the mixture as a point (temperature, grams per 100 g water). If it sits on the salt’s curve, it is saturated. Below the curve is unsaturated; above is supersaturated. The probe control does this classification for you.

Why is the NaCl curve almost flat?

Sodium chloride’s solubility changes only slightly between 0°C and 100°C (about 36–40 g / 100 g water). Potassium nitrate rises much more steeply over the same range — a standard contrast on school charts.

Can I print a blank solubility curve worksheet?

Yes. Turn on Worksheet mode to hide formula labels, then export PNG or SVG. You can also reveal practice answers after students try the questions.

Which salts are included?

KNO₃, NaCl, KClO₃, NH₄Cl, KCl, and NaNO₃ with reference solubility tables used in high-school chemistry. Toggle any combination on the chart.

Is this solubility curve tool free?

Yes. The precise solubility-curve mode runs in your browser from real data, with free SVG/PNG export and no image credits required for that mode.

Chemistry Tool

Solubility Curve Chart, Probe & Worksheet

Interactive solubility curve chart with real salt data (KNO₃, NaCl, KClO₃, NH₄Cl). Probe saturated vs unsaturated, export blank worksheets — free.

Real KNO₃ · NaCl · KClO₃ · NH₄Cl dataSaturated / unsaturated probeBlank worksheet exportSVG & PNG — free precise mode

Solutes (real textbook data)

Title

Probe: read the curve → saturated / unsaturated / supersaturated

Solute

Temperature (°C)g / 100 g water

unsaturated

At 40°C, KNO₃ solubility is 63.9 g/100 g. A mixture with 50 g is below the curve → unsaturated (more solute can dissolve).

KNO₃ and KClO₃ rise steeply with temperature; NaCl is nearly flat — match the shapes you see on school worksheets. Points above a curve are supersaturated.

Solubility Curve Examples

Rendered by the exact engine from reference solubility data — not AI guesses

View:

Four Salts Labeled

KNO₃ steep, NaCl nearly flat — the classic classroom comparison chart.

comparisonlabeled

KNO₃ vs NaCl

Why KNO₃ recrystallizes easily when cooled — huge drop in solubility.

kno3nacl

KNO₃ Steep Curve

Single-solute focus for reading values off the steep KNO₃ curve.

kno3

NaCl Flat Curve

Table salt barely changes solubility from 0–100°C.

nacl

Probe: Saturated / Unsaturated

Mark any (T, g) point and classify it against the curve.

probesaturated

Blank Worksheet

Hide labels for practice — export SVG/PNG for homework.

worksheetblank

What is a solubility curve?

A solubility curve graphs how many grams of a solute dissolve in 100 g of water at each temperature. Temperature is on the x-axis; solubility (g / 100 g H₂O) is on the y-axis. Each salt has its own curve. Classroom charts almost always include KNO₃ (steep) and NaCl (nearly flat) so students can see how temperature affects different compounds.

How to read saturated, unsaturated, and supersaturated

On the curve — saturated: the maximum amount dissolves at that temperature.
Below the curve — unsaturated: more solute can still dissolve.
Above the curve — supersaturated: more solute than the equilibrium maximum (unstable; crystals may form).

Why KNO₃ and NaCl look so different

KNO₃ solubility rises sharply as water warms, so cooling a hot saturated solution produces lots of solid crystals. NaCl barely changes with temperature, so heating does little to dissolve more table salt. Matching those shapes is a common exam check — this tool uses real reference data so the shapes are correct.

Worksheets and practice

Use Worksheet mode to hide salt labels, export a blank chart, and practice reading values or classifying mixtures. Toggle Show answers for the built-in practice set. Generator/maker search volume is near zero for this topic; teachers search for “solubility curve” and “solubility curve worksheet” — hence the bare URL slug.

Solubility curve vs heating curve

A solubility curve is about how much solid dissolves at each temperature. A heating curve (phase change diagram) is temperature versus heat added as a pure substance melts and boils. Use this page for solutions; use the Heating Curve tool for phase changes of a pure substance.