Ksp and Common Ion Effect Question Kaplan Q Banks

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betterfuture

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Question: Solid silver chloride (Ksp=1.8x10-10) was added to the vascular fluid in order to increase its osmotic pressure. How much of the silver chloride can be added to solution before the vascular fluid becomes contaminated with silver chloride precipitant

In the passage it states that vascular fluid is made of 935 mg of NaCl in 1 Liter of water.

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The answer they gave to the question was 1.0 x 10-8 g AgCl. The steps are correct but the molar mass of NaCl is 49.5 and NOT 58.5 as it states in the 4th line of the paragraph I posted. Doesn't this make their answer incorrect or can someone tell me where 58.5 came from. Maybe I am not seeing it right away. Thanks!

I got 9.67 x 10-9 which is roughly 1.0 x 10-8 but where did the 58.5 come from?

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The answer they gave to the question was 1.0 x 10-8 g AgCl. The steps are correct but the molar mass of NaCl is 49.5 and NOT 58.5 as it states in the 4th line of the paragraph I posted. Doesn't this make their answer incorrect or can someone tell me where 58.5 came from. Maybe I am not seeing it right away. Thanks!

The molar mass of NaCl is 58 - where are you getting 49??? Na = 23 and Cl = 35; 23 + 35 = 58.
 
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