Question

what percentage of salts must be removed from this sample of seawater before it can be considered freshwater (dissolved salts < 500 ppm )?

Answer 1

10.18 % of salts must be removed from this sample of seawater before it can be considered freshwater (dissolved salts < 500 ppm )

All natural water bodies contain dissolved solids (salinity) from contact with soil, rocks, and other natural materials. However, too much dissolved solids can affect water usage. Unpleasant taste, high water treatment costs, mineral build-up in plumbing, fouling, corrosion, and restricted use of irrigation are among the problems associated with elevated dissolved solids concentrations.

Dissolved matter concentration in water is the sum of all organic and inorganic matter dissolved in water. This is also known as Total Dissolved Solids or TDS. Calcium, magnesium, sodium, potassium, bicarbonates, sulfates, chlorides, nitrates, and silica typically account for the majority of dissolved solids in water.

Combinations of these ions – for example sodium and chloride – form salts, and salinity is another term often used to describe the level of dissolved solids in water.

How to Calculate Total Dissolved Solids

Total Dissolved Solids (or TDS) is a measure of all organic and inorganic substances dissolved in a particular liquid, giving the percentage of various solids. TDS can be used in many ways. For example, it can measure the degree of pollution of lakes and rivers, the mineral content of drinking water, but it can also be used for agricultural irrigation.

Several ways to calculate TDS

1. Use a conductivity meter
2. Use filter paper and scale
3. Divide the mass of solids by the total mass of the solution and multiply the result by 100 to get the weight percentage of solids is calculated. In this example, (17/167) * 100 = 10.18 percent.
4. TDS Saltwater and Drinking Water

Saltwater

More than 97% of the water on earth is saltwater in the ocean. Two percent of the water on Earth is stored as freshwater in glaciers, ice caps and snow-capped mountains.

Seawater or salt water TDS > 10,000 mg/l

Brine is also very salty water (TDS over 35,000 mg/l). Sea water is usually very salty (TDS >35,000 mg/l).

Drinking Water

TDS values ​​between 50 and 150 are generally considered to be the most suitable and acceptable. If the TDS level is around 1000 PPM, it is unsafe and not suitable for human consumption.

Example: Besler 20 liter cans maintain TDS levels of up to 120 PPM and are excellent for drinking.

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