How salty is salt water?

[QuantumBit]

How salty is salt water? I.e If I make a 100% salt water solution (Where salt wont dissolve anymore)  is it as salty as ocean water?

 

Thanks!

[Mira Yurizaki]

8 minutes ago, QuantumBit said:

How salty is salt water? I.e If I make a 100% salt water solution (Where salt wont dissolve anymore)  is it as salty as ocean water?

 

Thanks!

100% salt water is just salt at that point. Actually it'll be brine

 

The scientists have defined how "salty" water is by what percent mass the solution is in salt:

• Fresh water: <0.05%
• Brackish water: 0.05% - 3%
• Saline water: 3%-5% (the lower end is considered sea water)
• Brine: >5%

Edited December 12, 2016 by M.Yurizaki
More clarifications, yay!

[AkiraDaarkst]

7 minutes ago, QuantumBit said:

How salty is salt water? I.e If I make a 100% salt water solution (Where salt wont dissolve anymore)  is it as salty as ocean water?

 

Thanks!

A saturation solution of water+salt is going to be a lot saltier than ocean water.  The Dead Sea is saltier than ocean water.  Seawater has on average 3.5% salinity, the dead sea is 34%.

[QuantumBit]

1 minute ago, AkiraDaarkst said:

A saturation solution of water+salt is going to be a lot saltier than ocean water.  The Dead Sea is saltier than ocean water.

Thanks

[QuantumBit]

4 minutes ago, AkiraDaarkst said:

A saturation solution of water+salt is going to be a lot saltier than ocean water.  The Dead Sea is saltier than ocean water.

One question, if the dead sea is around 33.7% salty, does that mean a solution that can't dissolve any more salt is 100%?

[QuantumBit]

8 minutes ago, M.Yurizaki said:

100% salt water is just salt at that point. Actually it'll be brine

 

The scientists have defined how "salty" water is by what percent mass the solution is in salt:

• Fresh water: <0.05%
• Brackish water: 0.05% - 3.5%
• Saline water: 3%-5% (this is considered sea water)
• Brine: >5%

Can you explain a bit more? If I have a solution that can't dissolve any more salt would it be 50%?

[AkiraDaarkst]

6 minutes ago, QuantumBit said:

One question, if the dead sea is around 33.7% salty, does that mean a solution that can't dissolve any more salt is 100%?

Saturation does not mean that it takes 1 unit of volume/mass of the first element to dissolve into another 1 unit of volume/mass of the second element.  It just means the point when something will no longer easily dissolve into something else.  So yes, saturation would be 100%, for the given elements that are being mixed together.

[Guest]

Still not as much as my teammates...

 

% is the amount of salt inside the water. 99% means there is 99% of salt and 1% of water. 100% means 0% of water so that would not be a salt water

[QuantumBit]

1 minute ago, deXxterlab97 said:

Still not as much as my teammates...

 

% is the amount of salt inside the water. 99% means there is 99% of salt and 1% of water. 100% means 0% of water so that would not be a salt water

Thanks. So this means that 50% that I cant dissolve any more salt?

Edited December 12, 2016 by QuantumBit

[Mira Yurizaki]

7 minutes ago, QuantumBit said:

Can you explain a bit more? If I have a solution that can't dissolve any more salt would it be 50%?

It depends on how much salt the water can hold given some conditions. Cold water for instance holds more oxygen than hot water. The term you're looking for is saturation.

 

But saying something like "100% salt water" means it's either 100% salt or 100% water. Or it's just salty water. It's very ambiguous.

[AkiraDaarkst]

2 minutes ago, deXxterlab97 said:

Still not as much as my teammates...

 

% is the amount of salt inside the water. 99% means there is 99% of salt and 1% of water. 100% means 0% of water so that would not be a salt water

Yep, this is also true.  I was thinking in terms of saturation levels and not percentage of parts per volume/mass.

[Guest]

1 minute ago, QuantumBit said:

Thanks. So this means that 50% that I cant dissolve any more salt?

I am not a Chemist but there would be a point where there would be too much salt and not enough water to dissolve it

 

 

[QuantumBit]

2 minutes ago, M.Yurizaki said:

It depends on how much salt the water can hold given some conditions. Cold water for instance holds more oxygen than hot water. The term you're looking for is saturation.

 

But saying something like "100% salt water" means it's either 100% salt or 100% water. Or it's just salty water. It's very ambiguous.

Oh ok thanks

[QuantumBit]

Just now, deXxterlab97 said:

I am not a Chemist but there would be a point where there would be too much salt and not enough water to dissolve it

 

 

Ok I guess I'll stick with 50% then. Thanks!

[Guest]

1 minute ago, QuantumBit said:

Ok I guess I'll stick with 50% then. Thanks!

https://www.reference.com/geography/maximum-solubility-salt-water-b5cba303939f22e#

 

The maximum solubility of table salt (sodium chloride) in water at 20 degrees Celsius is 35.7 grams per 100 milliliters of water. The solubility of most solids increases as the temperature rises and decreases as the temperature lowers.

[AkiraDaarkst]

1 minute ago, QuantumBit said:

Ok I guess I'll stick with 50% then. Thanks!

50% would probably be too high since the amount of salt that can dissolve into water also depends on the temperature of the water.  The hotter the water the more salt that can dissolve into it and the solution is considered supersaturated.  At 20 degrees C, about 357 grams of salt can dissolve into 1 liter of water.

[captain_to_fire]

16 minutes ago, QuantumBit said:

How salty is salt water? I.e If I make a 100% salt water solution (Where salt wont dissolve anymore)  is it as salty as ocean water?

 

Thanks!

If you're in a chemistry class, titrate it with Silver Nitrate (AgNO3) and use Potassium Chromate as indicator (K2CrO4). The end point would be a faint orange cloudy solution. It is a double displacement reaction. The reasons why the 100% solution won't dissolve any salt anymore is because it's already saturated. However, even saturated solutions can dissolve more salt if it's subjected to external heat and frequent agitation.

[AkiraDaarkst]

The Dead Sea is probably very close to being saturated with salt if the water temperature was 20 degrees Celsius.  Having friends who have visited and swam in the Dead Sea, you can easily float in it and you will need a very very very thorough rinse off when you come out after a swim.  If you thought it was a pain to rinse yourself with fresh water after swimming in the ocean, it's several times worse with the Dead Sea.  Also, the Dead Sea is called the "Dead Sea" because the salinity is too high for any form of complex life besides bacteria and microorganisms.

[QuantumBit]

4 minutes ago, AkiraDaarkst said:

50% would probably be too high since the amount of salt that can dissolve into water also depends on the temperature of the water.  The hotter the water the more salt that can dissolve into it and the solution is considered supersaturated.  At 20 degrees C, about 357 grams of salt can dissolve into 1 liter of water.

Im sorry but how much would this be in percentages? 

[corrado33]

5 minutes ago, deXxterlab97 said:

https://www.reference.com/geography/maximum-solubility-salt-water-b5cba303939f22e#

 

The maximum solubility of table salt (sodium chloride) in water at 20 degrees Celsius is 35.7 grams per 100 milliliters of water. The solubility of most solids increases as the temperature rises and decreases as the temperature lowers.

 

This is the answer you're looking for. It is also mostly correct.

 

NaCl however, is weird. It's solubility does not increase appreciably as you increase temperature. 

[AkiraDaarkst]

3 minutes ago, QuantumBit said:

Im sorry but how much would this be in percentages? 

I guess you can think of it as 35.7 parts of salt for 64.3 parts water.  But it would also be viewed as 100% of salt (as in all the salt you've poured into the solution) saturated into the water.

[QuantumBit]

1 minute ago, AkiraDaarkst said:

I guess you can think of it as 35.7 parts of salt for 64.3 parts water.  But it would also be viewed as 100% of salt saturated into the water.

Ok thanks. Just to make sure I could write 100% for the solution I'm using, 33.7% for the dead sea etc?

 

[slightlyjaded]

Just now, corrado33 said:

 

This is the answer you're looking for. It is also mostly correct.

 

NaCl however, is weird. It's solubility does not increase appreciably as you increase temperature. 

Ionic bond with a polar solution.

 

At maximum saturation it basicaly has the chlorine hanging off the bent hydrogen side, and sodium hanging off the oxygen side. after that point it ceases being a salt water solution, and becomes a saltwater suspension.give us a sec, and I'll run the math.

[AkiraDaarkst]

13 minutes ago, QuantumBit said:

Ok thanks. Just to make sure I could write 100% for the solution I'm using, 33.7% for the dead sea etc?

 

No, you can't.  With the Dead Sea, they are measuring in parts per unit volume/mass.  Your 100% in this statement is implying 100% of one element has dissolved into the solution without leaving any leftovers.  If you equate the two then your 100% has to imply that the solution is made up of 100% salt.

[AkiraDaarkst]

40 minutes ago, QuantumBit said:

a 100% salt water solution (Where salt wont dissolve anymore)

This statement would be true for the following conditions:

1. Water temperature is 20 degrees Celsius
2. Volume of water is 1 liter
3. Mass of salt dissolved into the water is 357grams, and that no salt particle is left in the water undissolved

If the water temperature is higher or the water is more agitated, more salt will dissolve into the water before the solution becomes saturated.