Is Cornstarch Soluble Or Insoluble In Water? [Hot Water, Cold Water]

Is cornstarch soluble in water? The answer is no. Cornstarch is not soluble in water.
Cornstarch is a popular ingredient used in almost every home for one thing or the other. People use it in recipes to thicken soups, stews, sauces, and custard. Although most people use it, not everyone knows if it’s soluble or insoluble. 

In this article, you will learn more about cornstarch and why it is not water-soluble.

What is corn starch?

Corn starch is a food enhancer and widely used ingredient made from the starchy part of kernels. Manufacturers obtain starch from the endosperm of corn kernels.

In the kitchen, you can use it to thicken sauces, soups, and gravies. Corn starch is very versatile, and although most people believe it’s only for cooking, you can use it in places like factories and hospitals.

Additionally, cornstarch is perfect for making sugars and corn syrups and serves as an anti-caking agent. It also has other household uses, such as acting as a natural deodorant, soother for bites, blisters, etc.

SEE: Find Out Here if Cornstarch Go Bad After a Long While

Is cornstarch soluble in water?

No, cornstarch is not soluble in water. It does not contain properties that allow it to melt into liquid.

The fine powder has large molecules, like a chain wrapped up in starch granules. These large molecules are hydrophobic and tend to clump together.

Also, cornstarch is water resistant because of its structure. So, instead of dissolving in water, it separates.

As a suspension mixture, the particles in cornstarch spread through the water without dissolving. This particular characteristic of cornstarch determines what recipes you use cornstarch in and how you use it.

Unlike salt and sugar that dissolves in liquid, cornstarch does not melt in water but will react differently. Instead, it thickens. That’s why its uses are different from soluble ingredients.

Why is cornstarch not soluble in water?

Corn starch is not soluble in water because of its granular structure. Starch has a composition that makes it different from other carbohydrates. Even though starch is a type of carbohydrate, it contains macromolecules.

The presence of these large macromolecules makes cornstarch insoluble. Cornstarch also comprises amylopectin, which consists of a chain of glucose. Amylopectin contributes to the cornstarch’s ability to stay solid in water.

SEE: Can You Substitute Cornmeal For Cornstarch?

What happens when you mix cornstarch with water?

When you mix cornstarch and water, a lot of reactions occur. Both join to form what is called a “suspension.”

Suspension occurs when the cornstarch disperses into the liquid. If you press the mixture quickly, the starch molecules close together. When it closes together, water gets stuck between starch chains.

Water stuck between starch chains results in a semi-rigid structure. The cornstarch does not melt or dissolve. Instead, when mixed, both act separately like a solid and liquid simultaneously.

The solid (cornstarch) and liquid (water) mix well enough to form a thick, creamy consistency. But then, when you stir the cream, it feels almost like a liquid until you squeeze it, and it starts to feel like paste. It even gets pasty enough for you to roll it into a solid ball.

However, don’t try to hold the ball because it loses its structure and trickles. Immediately after you stop mixing, the cornstarch settles and separates from the water again.

Cornstarch reacts to water in different ways except for dissolution. Its reaction also depends on the temperature of the water.

Is cornstarch soluble in cold water?

No, it is not. Cornstarch does not dissolve in cold water. Because starch granules are too tiny for the naked eye to see, you may think they dissolve. But in fact, they stay suspended in cold water and remain solid.

You should know that cold water and cornstarch mixture is not useless. Even though there is no dissolution, you can still use the solid and liquid mixture. Cornstarch with water forms the paste you use as a thickener. Most people call the paste a slurry.

SEE: Does Distilled Water Ever Go Bad?

Is cornstarch soluble in hot water?

No, it is not. If you directly add hot water to cornstarch it will clump. Naturally, when you mix a dry ingredient with a moist one, it will clump.

The starch granules gradually absorb the hot water and expand, resulting in a thick paste.

Why does cornstarch thicken in water?

Cornstarch thickens in water because of its ability to absorb liquid.

When you mix cornstarch and water, granules swell, hold water, and burst. The eruption causes it to form clumps, and it absorbs liquid instead of turning watery.

SEE: Can Corn Flour Substitute Cornstarch?

What other substance is not soluble in water?

Flour is not soluble in water because it consists of starch granules, lipids, and proteins. These elements have a molecular structure that absorbs liquid. Rather than flour dissolving, it holds water and forms a sticky suspension.

What substances are soluble in water?


Yeast is soluble in water.

However, you can only dissolve it with water at a particular temperature.

The yeast fungi are insoluble in cold water and slightly soluble in warm water. Note that the water should be warm, not hot or cold.


Sugar in solid form consists of individual molecules held together by weak intermolecular forces. When sugar comes in contact with water, the fragile bonds between the molecules break.

The breakage causes the molecules to be released and turned into a solution. Sugar has the highest solubility among all compounds scientists have tested.


Salt is soluble in water.

When you mix salt and water, salt breaks down and dissolves. When the salt dissolves, you will no longer be able to see it. It liquefies, becoming one with water, though it changes the taste of the liquid.

So, when you mix salt and water, salt turns to liquid while water tastes salty.

Baking soda

This is highly soluble in water.

The reason is that baking soda is a salt, so it acts like one. Also, baking soda dissolves in hot, warm, or cold water. Although, higher temperatures help it dissolve faster.

To check if it’s soluble, pour the baking soda into a glass of water and stir. Ensure you stir for thirty seconds until the liquid becomes uniform and cloudy.


What does the cornstarch and water mixture feel like?

The water and cornstarch mixture feels like a paste. It’s possible to roll the paste into a ball, except it won’t stay together. When you try to grip it, it’ll go back to its solution form.

What is the water and cornstarch mixture called?

The water and corn starch mixture is called Oobleck. The name comes from a Dr. Seuss story and is popular among children.

How do you activate cornstarch?

You activate starch by allowing the cornstarch and liquid mix to cook until it bubbles.

Let the mixture boil for about ten to fifteen minutes. After, you’ll see that the cornstarch mix has started thickening.

How long does it take to thicken cornstarch in sauce?

It takes about a minute or two for cornstarch to thicken.

Therefore, you should avoid simmering your sauce for a long time after adding cornstarch.

Does cornstarch affect the taste of food?

No, cornstarch does not affect the taste of food.

Cornstarch is a coarse substance farmers get from dry corn kernels. It comes mostly without flavor and is added to food to thicken, not add taste.


Cornstarch is hydrophobic and likes to avoid water. It has unique properties that make it perfect for recipes that need a thickener like stews, sauces, and mustard.

While cooking, it always looks like the starch is dissolving. On the contrary, all that’s happening is the breaking apart of its molecules from the liquid to form clumps.

Finally, its chain-like molecules wrapped in starchy granules are what cause it to be insoluble.

Thanks for reading.

You can read about the differences between cornstarch and corn flour on Cheffist.