how much salt to make an egg float

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Some objects float and some sink, right? Well, that depends on what you're floating them in. A fresh egg sinks in evidently h2o, just it'south surprisingly like shooting fish in a barrel to bring it up to the surface. All you demand is a single ingredient from your kitchen.

1. 1

   Fill a tall drinking glass with water. Go out some infinite at the elevation, simply don't drop the egg in withal. Since an egg is denser than patently water, it would only sink.

   • Density describes how much "stuff" (mass) is pressed into a infinite (volume). If yous pick upwards two objects the same size, the one that feels heavier is denser.

2. 2

   Stir in plenty of common salt. Stir about 6 tablespoons (90 milliliters) of salt into the glass of water. Go on stirring until virtually all the table salt dissolves. (You should see almost no common salt crystals at the lesser of the glass.)

   • When table salt dissolves in h2o, information technology "sticks" to the water molecules, plumbing fixtures between them and even pulling them closer together. This means the mass increases, but the volume stays about the same.

3. three

   Drop in an egg. The saltwater yous fabricated is denser than the glass of plainly h2o was. If you added enough common salt, the h2o is now denser than the egg. Test this by gently dropping the egg into the glass of water. If the water is denser, the egg will float.

   • If the egg doesn't float, add more salt. Make sure to stir until the table salt is dissolved.

4. 4

   Slowly pour tap water on top. If y'all cascade the tap water in gently, it will sit on top of the saltwater without mixing together. The egg is lighter than the saltwater but denser than the tap water, and then it will float in the middle of the glass!^[1]

5. 5

   Learn virtually the chemistry. Here's a more complete explanation: when tabular array salt (chemical formula NaCl) dissolves in water, information technology breaks autonomously into two atoms: sodium (Na⁺) and chlorine (Cl^-). The + and - symbols tell you that these atoms are "ions," meaning they have an electric charge. Since the reverse ends of a h2o molecule as well have electric charges, the ions attract the water molecules closer and grade a tight connection.^[ii]

6. 6

   Try adding more than common salt. If adding more salt makes the mixture denser, can you keep going? Could you add then much salt that a hammer could bladder on the h2o? Think about it (or test it), then click here to run across the answer.

1. 1

   Test eggs as they age. Is a fresh egg denser than an old egg, or is it the other way around? Line up several glasses of h2o with different amounts of salt stirred in, from plain water to heavy table salt water. Drop a fresh, raw egg into a glass, so move it left or right until you find the least salty water the egg can float in. Echo this each day, using a new egg from the same carton. As the eggs go older, practise they bladder in more glasses, or sink? Read nearly what happened once yous've tested it.

   • If yous tin, become your eggs directly from a farmer. Supermarket eggs are oft a couple weeks old when y'all buy them, and then information technology will be harder to observe the deviation.^[three]

2. two

   Bladder boiled eggs. Do you retrieve boiling an egg would alter its density? Ready upward the same experiment – a row of h2o with different amounts of salt – but this time, compare fresh eggs with boiled eggs. Is there a difference? Read about the results.

3. iii

   Notice the minimum amount of salt to bladder an egg. Can y'all think of a mode to make a glass of salt water with the aforementioned density every bit the egg? Here's one approach:^[four]

   • Stir ⅓ loving cup (80 mL) table salt into 1⅔ cups (400 mL) water until it all dissolves. This is a "stock solution" yous will use to make other salt water mixes.
   • Fill glass number one with ¾ cup (180 mL) of the stock solution.
   • Fill spectacles 2 through v with ¾ cup plain water each.
   • Mix ¾ loving cup stock solution into glass number two. This is now half as salty as glass ane.
   • Take ¾ loving cup from drinking glass two and mix it into drinking glass 3. Glass 3 is at present half as salty every bit drinking glass 2.
   • Mix in ¾ cup from drinking glass 3 into glass 4. Leave glass 5 as plain water.
   • Effort to float an egg in each glass. If yous got close to the density of the egg, it will float in the heart of the glass, stand up on the base, or bob only below the surface.

Add New Question

• Question

  If I put the egg get-go, followed by salt, will it still float?

  

  No, the salt must be dissolved in the solvent (water) first. Mixing will allow the creation of bonds between the sodium chloride molecules and H2O molecules. Too, when you add the egg start, followed by the salt, the egg might crevice when you're trying to mix the solution. Calculation to this, the common salt solution might become saturated/supersaturated.

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Answers

• What happens if you continue adding salt? Eventually you won't be able to dissolve it no matter how much you stir. There'due south no more space left between the water molecules.
• Do older eggs float more easily? As eggs age, they release water vapor and gas through tiny holes in the egg shell, losing mass (and therefore density). Somewhen, an egg will float in plain water.^[v]
• Do boiled eggs float more easily? You probably did not notice any difference betwixt the eggs. The within of the boiled egg changed form, merely since the volume and mass did not alter, neither did the density. (Eggs may lose a little h2o when boiled, but this mass loss is so pocket-size it is difficult to observe.)^[6]

• If you are doing a science experiment, label all your glasses and write downwards the corporeality of salt and water yous put in each ane.

Thanks for submitting a tip for review!

• Wash your easily in soap and water after treatment raw eggs. Salmonella leaner tin can live on the vanquish or inside the egg.^[7]

Things You'll Demand

• Glass of water
• Spoon
• Egg
• Table salt

About This Article

Article Summary X

To make an egg float, kickoff by filling a tall glass with water, leaving some space at the meridian. Then, stir vi tablespoons of salt into the water until information technology's nigh completely dissolved, which will make the h2o denser. Finally, advisedly driblet an egg into the glass and watch it float, which happens because the h2o is now denser than the egg itself. To learn how to exercise science experiments using floating eggs, scroll down!

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