Depends what object - also depends on a few other factors.
It depends on the density of the object you are using
The amount of salt required for an object to float depends on the object's density. For example, in water, objects will float when they displace an amount of water equal to their weight. Adding salt to increase the water's density can make it easier for less dense objects to float. The specific amount of salt will vary depending on the object's weight and size.
5 cups of salt
for a brick to float on water 2 thirds of the mixture should be salt
An apple can actually float in water that is not treated with salt. Adding salt will encourage the apple to float to the top. When you add salt to water, it allows the water to become more dense.
to make an egg lout it takes at least five tablespoons of salt It depends on what type of salt you use to make the egg float. it would be a fun science fair project for elementary to middle school. my son did this and he had a lot of fun. i used walmart brand salt and it works best
About 6 tablespoons - Check out the link below
About 6 tablespoons- Check out the link below
About 6 tablespoons - Check out the link below
About 6 tablespoons - Check out the link below
The Buoyancy of an Egg
The problem statement is to determine how much salt needs to be added to water in order for an egg to float in it. This involves experimenting with different amounts of salt until the egg reaches a buoyant state in the water.