Question

soda water/sea water which one is solution ? don't give irrelevant answers plz. ​

Answer 1

Answer:

Adding salt does two things - it increases the boiling point, meaning it will boil at a higher temperature, and it decreases the specific heat capacity, meaning it will heat up quicker.

So, if you have 1kg of fresh water and 1kg of salt water, the salt water will boil quicker. That’s because there is less water, and more salt.

If there’s a 20% solution of salt, there’s 0.8kg of water, and 0.2kg of salt. The heat capacity of water is 4.19 kJ/kg and the heat capacity of salt is 0.88. So, the heat capacity of the solution is 0.8*4.19+0.2*0.88=3.528kJ/kg. So, we have to put 3.528kJ of energy in to heat it up by 1K. That’s compared to 4.19kJ for fresh water. That difference overrides the need to heat up to a higher temperature to make it boil.

A 20% solution will apparently boil at 102C compared to 100C.

So, to heat up from 20C to 100C, the fresh water will use 80 * 4.19kJ = 335.2kJ

To heat from 20C to 102C, the salt water will use 82 * 3.528kJ = 289.3kJ

So, the 1kg of 20% salt water will heat up using less energy, and thus quicker.

(This is ignoring heat losses)

BUT, if you have the same amount of water in two pots and you add salt to one and not the other, the one without the salt will boil quicker.

That’s because we have the same amount of water AND some salt, so the salt will need more heat to warm up AND the water will boil at a higher temperature

If we have 1kg (1 litre) of water and 0.2kg of salt, the heat capacity is 1*4.19+0.2*0.88=4.366kJ. So, in this case, we have to put in more energy than for the same volume (not mass) of fresh water to raise the temperature.

The 1 litre of of salt water here will use 82 * 4.366kJ = 358kJ to heat up to 102C. Thus it will require more energy than the 1 litre of fresh water to get to boiling point, and thus take longer.

Answer 2

Explanation:







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