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8 May, 07:52

A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood. what is the molarity of a physiological saline solution? (note: w/v means mass to volume)

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  1. 8 May, 09:57
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    1) 0.89% m/v = 0.89 grams of NaCl / 100 ml of solution

    => 8.9 grams of NaCl in 1000 ml of solution = 8.9 grams of NaCl in 1 liter of solution

    2) Molarity = M = number of moles of solute / liters of solution

    => calculate the number of moles of 8.9 grams of NaCl

    3) molar mass of NaCl = 23.0 g / mol + 35.5 g/mol = 58.5 g / mol

    4) number of moles of NaCl = mass / molar mass = 8.9 g / 58.5 g / mol = 0.152 mol

    5) M = 0.152 mol NaCl / 1 liter solution = 0.152 M

    Answer: 0.152 M
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