Problem 11.117 There\'s actually much more in seawater than just dissolved NaCl.

Question

Problem 11.117

There's actually much more in seawater than just dissolved NaCl. Major ions present include 19,000 ppm Cl, 10,500 ppm Na+, 2650 ppm SO24, 1350 ppm Mg2+, 400 ppmCa2+, 380 ppm K+, 140 ppm HCO3 and 65 ppm Br.

Part A

What is the total molality of all ions present in seawater?

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Part B

Assuming molality and molarity to be equal, what amount of osmotic pressure in atmospheres would seawater give rise to at 300 K?

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Problem 11.117

There's actually much more in seawater than just dissolved NaCl. Major ions present include 19,000 ppm Cl, 10,500 ppm Na+, 2650 ppm SO24, 1350 ppm Mg2+, 400 ppmCa2+, 380 ppm K+, 140 ppm HCO3 and 65 ppm Br.

Part A

What is the total molality of all ions present in seawater?

molality =   m  

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Incorrect; Try Again; 2 attempts remaining

Part B

Assuming molality and molarity to be equal, what amount of osmotic pressure in atmospheres would seawater give rise to at 300 K?

=   atm  

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Incorrect; Try Again; 4 attempts remaining

Not quite. Check through your calculations; you may have made a rounding error or used the wrong number of significant figures.

Explanation / Answer

The molality is 1.14 m

you are assuming that the molarity = molality, then you calculate osmotic pressure as:

Osmotic pressure = MRT
Osmotic pressure = 1.14 mol/L (0.08206 Latm/molK) (300K) = 28.1 atm

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