Posted by Morgan on Thursday, February 2, 2012 at 9:08pm.
1L of 5% NaCl has 50ml of NaCl, so 10ml has 0.5ml of NaCl
1L of 2% NaCl has 20ml of NaCl, so 5ml has 0.1ml of NaCl
So, you end up with .6ml of NaCl in 15ml of solution, or 4%
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