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Apparatus: Top pan balance and beaker
Step 1: We could use distillation to get salt and water separately Step 2: Measure the volume of the water by the beaker in the unit of dm^3 and write it down in a note Step 3: Measure the mass of the salt by putting it onto the top-pan balance in the unit of gram and also write it down on the note Step 4: Divide the mass(g) of the salt by the volume of the water to get the total salt concentration in (g/dm^3)
Step 5: Write down the final answer on that note

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Sodium (Na) is a very soft group 1 silvery-white metal. Sodium is the most common alkali metal and the sixth most abundant element on Earth, comprising 2.8 percent of Earth's crust. The metal takes up 10.7% of the composition in seawater, and it can be produced from sodium carbonate, a mineral salt found in rocks

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Potassium is an alkaline metal, a chemical element with the symbol K and atomic number 19. It is an extremely reactive metal which can easily react with moisture or cold water. Seawater contains about 400 ppm potassium. It tends to settle, and consequently ends up in sediment mostly. The potassium can be mainly attributed to potassium carbonate, a mineral that can be found in rocks and the Earth's crust.

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Sulfate (SO4) is a sulfur-based oxide that can have a natural or human-made origin. These salts can appear in the soil, air, and water. Sulfates can form during the decay of plant and animal matter, but they can also form as byproducts from the textile, mining, steel mill, and tannery industries.
It can be produced from sulfuric acid (H2SO4), which is an acid.

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Chlorine is a yellow-green halogen gas at room temperature. Chlorine is the most abundant element dissolved in seawater. It has a conservative distribution that varies only due to differences in evaporation or precipitation in the water that sank to form intermediate or deep waters in the sea. It can be produced by hydrochloric acid.

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Magnesium (Mg) is an alkaline earth metal, a shiny gray solid which shares many physical and chemical properties with the other five alkaline earth metals. It makes up about 3.7% of the seawater's mass. The metal can be produced from the carbonate magnesium carbonate, another mineral salt.

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Calcium is a chemical element with the symbol Ca and atomic number 20, a quite abundant alkaline earth metal. It is the main component of our bones. Seawater contains approximately 400 ppm calcium (1.2%). One of the main reasons for the abundance of calcium in water is its natural occurrence in the earth's crust. Calcium is also a constituent of coral. The calcium can be largely traced back to calcium carbonate, which is lime.