Most heavy chemicals have to be dissolved in water or solvents before they deserve to be used. Learning the best temperature because that dissolving each particular chemical can help us conserve time and energy in the dissolving process.

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Scientists often perform their very own tests in order to learn around the result of temperature top top the price of dissolving and also create a graph that can help them because that future reference.


In this project, you will research the effect of temperature ~ above the price of dissolving any details chemical in water. The chemical the you choose can be amongst the chemistry that are low hazard and can be uncovered at home. Salt, baking soda, citric acid, and also sugar space some good examples. You may obtain other chemicals such as copper sulfate, Calcium chloride and lime locally. After ~ performing essential experiments you must produce a graph to show the rate of dissolve in different temperatures.


This project guide has information that you require in order to start your project. If girlfriend have any kind of questions or need more support around this project, click the “Ask Question” button on the top of this page to send me a message.

If friend are brand-new in doing scientific research project, click on “How come Start” in the main page. Over there you will find valuable links that describe different varieties of science projects, clinical method, variables, hypothesis, graph, abstract and all other basic basics the you need to know.

Project advisor

Information Gathering:

Find out around dissolving as a molecule level interaction between solids and liquids. Girlfriend may additionally learn about some related subjects such as the effect of polarity in dissolving and also learn the ionic substances can only be dissolved in a polar liquid such together water and non-ionic substances deserve to only be liquified in non-polar liquids such as acetone. Read books, magazines or ask professionals who might know in order come learn about the techniques that you may test the rate of dissolving in details temperatures. Save track of wherein you got your info from.

The following are samples of details that you may find.

Ionic solids (or salts) contain optimistic and an unfavorable ions, i beg your pardon are held together through the strong force the attraction in between particles through opposite charges. As soon as one of this solids dissolves in water, the ion that kind the solid room released into solution, where they become linked with the polar solvent molecules.



Why is it necessary to know the temperatures that maximize solubility because that each substance?

Solid chemicals execute not react on each other. With exemption of explosives, all various other chemical reactions are done with liquid chemicals. You first make a systems of each ingredient, react the solutions and also then you different the commodities by approaches such together crystallization, filtration or precipitation.

In every such reactions, we attempt to use the minimum quantity of water due to the fact that later we have to remove the overabundance water. Removed the overfill water needs time, fuel and other costs connected with separation process.

By discovering the temperature in i beg your pardon a substance has actually the highest solubility we have the right to avoid excess water and related costs in chemistry reactions and also minimize the manufacturing cost.

Question/ Purpose:

What carry out you want to find out? write a explain that defines what you desire to do. Use your observations and questions to write the statement.

The function of this job is to learn exactly how temperature affect the rate of dissolve of a specific solid in a specific liquid.

More specifically I will examine the impact of temperature on the price in which table salt or rock salt dissolves in water.

Similar procedures can be supplied to determine the effect of temperature ~ above the rate of dissolve for other solids and also other liquids.

Identify Variables:

When friend think you recognize what variables may be involved, think around ways to readjust one at a time. If you change an ext than one at a time, you will certainly not know what change is leading to your observation. Periodically variables room linked and work with each other to reason something. At first, try to select variables that you think act separately of every other.

The independent variable (manipulated variable) is the temperature. (0ºC come 100ºC)

The dependent change (responding variable) is the price in which salt (a solute) dissolves in water (a solvent).

Controlled variables space air pressure and also other ecological factors.

Constants are:

The type of waterThe type of saltExperiment methodExperiment locationTools and also Instruments provided in experiments


Based on her gathered information, do an education guess about what types of things affect the mechanism you space working with. Identifying variables is necessary prior to you have the right to make a hypothesis.

Following is a sample hypothesis:

The rate of dissolve salt in water will increase by temperature. My hypothesis is based on my an individual observations that heat speeds up dissolving.

Experiment Design:

Design an experiment come test every hypothesis. Make a step-by-step list of what friend will execute to answer every question. This list is dubbed an speculative procedure. Because that an experiment to provide answers you have the right to trust, it must have a “control.” A regulate is secondary experimental trial or run. The is a different experiment, done exactly like the others. The only distinction is the no speculative variables are changed. A control is a neutral “reference point” for comparison that permits you to watch what changing a variable does by comparing it to not an altering anything. Reliable controls room sometimes very hard come develop. They have the right to be the hardest part of a project. Without a regulate you cannot be sure that changing the variable causes your observations. A collection of experiments that has a control is referred to as a “controlled experiment.”


Dissolving price of salt in water at various temperatures.

Introduction: The price at which rock salt disappear in water in ~ 11 various temperatures is observed.


Label 11 beakers v numbers 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 and also 100 to represent the check temperatures in which you are trial and error the dissolve rate. Devices are levels of Celsius.Prepare 11 little plastic bags through 100 grams rock salt crystals in every bag.Prepare adequate amount of ice cream water (0ºC) in a separate container. Add 200 ml water to the beaker labeled 0. Add 100 grams of rock salt to the water and also stir it because that 5 minutes.Carefully different the continuing to be salt (whatever is not liquified in water), then dried it and weigh it to see exactly how much that salt did no dissolve in water. Climate subtract the from 100 to recognize the quantity of salt dissolved in water. Record your results.Prepare 200 ml water at 10ºC. You might need to change the temperature by adding some ice water or some hot water to constant tap water to carry out this. Add 100 grams of absent salt come the water and also stir it because that 5 minutes.Carefully separate, dry and also mass any un-dissolved salt. Subtract it from 100 to identify the quantity of dissolved water. Document your results.Repeat this experiment for 20ºC, 30ºC, 40ºC, 50ºC, 60ºC, 70ºC, 80ºC, 90ºC, and 100ºC waters. Use an electric heater to warm up the water together needed.

Your outcomes table will look prefer this:

Amount that salt dissolved in water at different temperatures

Water TemperatureSalt liquified in 200ml waterDissolving rate
0……… grams

Use the temperature column and also dissolving rate obelisk of your results table to draw a line graph.

Notes/ Remarks:

To separate staying un-dissolved crystals in a beaker, you may use a filter paper and a funnel. Coffee filter functions fine.You might make your measurements in the American system instead of the metric system. For instance instead of Celsius degrees, you may use Fahrenheit degrees. You may need to make necessary adjustments if you select to do it the way.You might perform similar experiments on any kind of other water soluble substance.

Make a graph:

When your results table is ready, use it to make a bar graph. Friend will just use the first and the last columns of her table to draw a graph. In this method your graph will display the relation between the temperature and the solubility.

Make one upright bar because that each the the temperature you test. For example if you are trial and error four various temperatures, you will certainly have 4 bars. The height of every bar represents the solubility price at each details temperature. For example you may use a 20″ bar because that 20% solubility.

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Make sure you compose the temperature below each bar. Likewise write the solubility rate over or over each bar.