Dead Sea Salinity

[tgif22]

For demonstration purposes, (to float things on) I am bringing two tubs of water to my presentation - one with the salinity of normal water, and one with that of the Dead Sea. From my understanding, since the dead sea is 34.2% salt, if I mixed 684g of salt with 2kg of distilled water, would that accurately represent the water in the Dead Sea?

[studiot]

8 hours ago, tgif22 said:

For demonstration purposes, (to float things on) I am bringing two tubs of water to my presentation - one with the salinity of normal water, and one with that of the Dead Sea. From my understanding, since the dead sea is 34.2% salt, if I mixed 684g of salt with 2kg of distilled water, would that accurately represent the water in the Dead Sea?

 

I think you will find that salinity is expressed in (grams of solute per kilogram of solution) x 100 when expressed as a precentage.

 

So 32.4% salinity is 32.4 grams of salt per 1000g of soution.

[tgif22]

8 hours ago, studiot said:

 

I think you will find that salinity is expressed in (grams of solute per kilogram of solution) x 100 when expressed as a precentage.

 

So 32.4% salinity is 32.4 grams of salt per 1000g of soution.

https://www.sciencedaily.com/terms/seawater.htm

but from this article, it says that the ocean has a salinity of 3.5%, and it says that means 35 parts-per-thousand. I'm not sure that I understand?

8 hours ago, studiot said:

 

I think you will find that salinity is expressed in (grams of solute per kilogram of solution) x 100 when expressed as a precentage.

 

So 32.4% salinity is 32.4 grams of salt per 1000g of solution.

and this article says that there'd be around 250g of salt left if you boiled a liter of dead sea water.

http://www.sciencefocus.com/qa/how-much-salt-there-dead-sea

[studiot]

Have you tried looking it up in a more reliable place?

 

https://en.wikipedia.org/wiki/Saline_water

 

For instance the maximum amount of salt you can dissolve in 1 litre of room temperature water is a little over 260 grams and you wanted to add 342.

 

The salinity of the open ocean is about 36 parts per thousand or 36 grams per litre. I haven't looked up the dead sea, Have you?

11 hours ago, studiot said:

 

I think you will find that salinity is expressed in (grams of solute per kilogram of solution) x 100 when expressed as a precentage.

 

So 32.4% salinity is 32.4 grams of salt per 1000g of soution.

Yes you are right I should have said 32.4 grams per 100 grams of solution.

Sorry, I confused ^o/_o and ^o/_oo

Edited February 3, 2018 by studiot

[Sensei]

On 3.02.2018 at 2:07 AM, tgif22 said:

For demonstration purposes, (to float things on) I am bringing two tubs of water to my presentation - one with the salinity of normal water, and one with that of the Dead Sea. From my understanding, since the dead sea is 34.2% salt, if I mixed 684g of salt with 2kg of distilled water, would that accurately represent the water in the Dead Sea?

If you will mix 684 g of salt with 2000 g of water you will have total mass 2684 grams.

684 g / 2684 g = ~ 0.255 = ~ 25.5% by mass.

According to wikipedia page about Dead Sea:

"With a salinity of 342 g/kg, or 34.2%, (in 2011), "

https://en.wikipedia.org/wiki/Dead_Sea

but it's not only NaCl!

 

References that you should read:

https://en.wikipedia.org/wiki/Mass_concentration_(chemistry)

https://en.wikipedia.org/wiki/Mass_fraction_(chemistry)

 

4 hours ago, studiot said:

For instance the maximum amount of salt you can dissolve in 1 litre of room temperature water is a little over 260 grams and you wanted to add 342.

https://en.wikipedia.org/wiki/Sodium_chloride

Sodium Chloride has solubility in water ~ 359 g/L

 

Here you have table how it changes with temperature:

https://en.wikipedia.org/wiki/Solubility_table

 

But Dead Sea is not just NaCl, but many other salts mixed together:

https://en.wikipedia.org/wiki/Dead_Sea_salt

Summing mg/L from the table we can get 338 g/L

Notice that there is more Magnesium Chloride, and it has solubility 558 g/L @ 30 C.

"Most oceanic salt is approximately 85% sodium chloride (the same salt as table salt) while Dead Sea salt is only 30.5% of this, with the remainder composed of other dried minerals and salts."

 

Edited February 4, 2018 by Sensei

[tgif22]

Thank you for the answers. To sum it up, if if I dissolved 684g of salt into 1316g of near-boiling water, it would be roughly 34.2% salt. Correct?

[studiot]

Thank you Sensei. +1