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Old Jan 12th 2018, 08:13 AM   #1
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Chemistry Homework Help

Hi. I have a task that I can`t solve by myself. In a lab a student dissolves 6.9 g of sodium chloride in 125 g of water what is the molaity concentration of a solution.

Last edited by topsquark; Jan 13th 2018 at 02:55 PM.
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Old Jan 12th 2018, 08:57 PM   #2
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Atomic mass of Na = 22.99 Atomic mass of Cl = 35.45

so atomic mass NaCl = 58.44

If 58.44 gms of salt is made up to 1 liter , this is said to have a molality concentration of 1

But we have 6.9 gms in 125 cc ....same concentration as 55.2 in a liter

Almost 1 M (an adjustment needs to be made because 125cc was added to salt , and not made up to 125cc)
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