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An ice-bath made with sodium chloride will be 9 ± 1 oC when the solution is about 23% sodium chloride by mass. The density of solid sodium chloride is about 2 g/cm3. What volume of solid NaCl would you add to 200 g water to make a 23% NaCl solution?

ANY HELP WOULD BE AWESOME!THANK YOU!! :)

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Jamie
4 answers

  1. 23% NaCl is 23 g NaCl/100 g solution.
    so 200 g soln is 46g NaCl.
    mass = volume x density so
    volume = mass/density = 46/2 = ? cc.

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    DrBob222

  2. I got 23...but the answers available are a. 10 mL
    b. 30 mL
    c. 50 mL
    d. 100 mL ... is there something that I am doing incorrectly?

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    Jamie

  3. my error. I read that as 200 g SOLUTION but it is 200 g H2O
    23% NaCl is 23 g/100 g solution which is 23 g NaCl in 77 g H2O. grams NaCl in 200 g H2O is 23 x 200/77 = ?
    and ?/2 = ?cc.

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    DrBob222

  5. I got 30 this time! Yay! Thank you so much DrBob222! I really appreciate it!

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    Jamie

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